Board Game Box Set vs. Individual Expansions: Which Should You Buy?

Quick answer

If you are new to a game system or want the most content for your money, a box set is usually the better buy. If you already own the core game and want to tailor your experience, individual expansions give you more control. Your choice depends on how much you already own and how you play.

You are standing in a game store or scrolling an online shelf, and you see two paths: a big box set that promises a complete experience, or a smaller expansion that adds just one new thing. Which one actually gives you more value? The answer is not one-size-fits-all, but it comes down to what you already own and how you play.

In this comparison, we look at the real trade-offs between box sets and individual expansions. We will use examples from our shelves, including Warhammer 40,000 and Age of Sigmar products, to show how the decision plays out in practice. By the end, you will know which option fits your table and your budget.

What you get in a box set vs. an expansion

A box set is designed as a self-contained entry point. It usually includes everything needed to play: miniatures, rules, dice, and sometimes terrain or tokens. For example, the Warhammer 40,000 Leviathan Termagants HJI-16 is a used set that offers a squad of Termagants at a fraction of the original price. Because it is a secondhand product, sales are final and sold as-is, but you get a ready-to-play unit without hunting for individual pieces.

An individual expansion, by contrast, assumes you already have the core game. It adds new units, characters, or rules to deepen your existing collection. The Astra Militarum: Krieg Lord-Marshal Dreir is a single character model that expands your army with a new commander. It does not include rules or dice, so you need the core book to use it. The trade-off is clear: box sets give you breadth, expansions give you depth.

• Check whether a box set includes the core rules; some do, some do not.
• Expansions often require the base game to function, so factor that cost in.

Cost and value: where your money goes

Box sets typically offer a lower cost per model or component because they are bundled. The Warhammer 40,000 Venom HHC-28 is a used vehicle that originally retailed for much more, but our secondhand price makes it an affordable way to add a transport to your army. If you are building a new force, a box set can save you money compared to buying each unit separately.

Individual expansions are often priced for a specific addition, so the value depends on how much you will use that one piece. The Age of Sigmar Killaboss With Stab-Grot GPR-05 is a used character set that costs less than a typical new box, but it only adds one leader and his companion. If that model fills a gap in your army, it is great value; if not, it may sit on your shelf. Always compare the price per usable unit, not just the total price.

• Calculate cost per model or per hour of play to compare value fairly.
• Secondhand items are sold as-is, so inspect photos carefully before buying.

Storage, space, and hobby time

Box sets take up more shelf space and often require assembly and painting before you can play. The Space Marines: Primaris Apothecary comes as 28 components and includes a transfer sheet, so you will need clippers, glue, and paint to get it table-ready. If you enjoy the hobby side, that is a bonus; if you want to play immediately, it is a hurdle.

Individual expansions are smaller and easier to store, but they still need assembly if they are plastic kits. The Warhammer 40,000 Venom HHD-31 is another used vehicle that adds a fast attack option without committing you to a full box. For players with limited storage or time, buying one expansion at a time can be more manageable than a large box set that dominates your workspace.

• Measure your shelf space before buying a large box set.
• Keep a small tool kit with clippers, glue, and a file for assembly sessions.

How to decide based on your collection

If you are starting a new army or game system, a box set is usually the smarter first purchase. It gives you a playable force and often the rules you need. For example, the Warhammer 40,000 Leviathan Termagants HJI-16 can be a cheap way to add a core unit to a new Tyranid force. Once you have that foundation, you can branch out with individual expansions that fill specific roles.

If you already own the core game and know exactly what your army lacks, individual expansions are more efficient. The Astra Militarum: Krieg Lord-Marshal Dreir is a targeted addition for a specific faction, not a starter set. Buying it when you already have infantry and tanks makes more sense than buying another box set that duplicates what you own. The key is to avoid buying duplicates just because a box set looks like a bargain.

• List what you already own before shopping to avoid duplicate units.
• Buy expansions that fill a gap in your current force, not just what looks cool.

Trade-offs at a glance

• Upfront cost vs. long-term value: Box sets cost more upfront but usually give a lower price per model. Expansions cost less per purchase but may add up if you buy many. If budget is tight, start with one expansion that fills a gap, then save for a box set.
• Immediate play vs. hobby time: Box sets often require significant assembly and painting before play. Expansions are smaller but still need hobby time if they are plastic kits. If you want to play tonight, look for pre-assembled or used items, or stick to games that are ready out of the box.
• Collection fit vs. shelf space: Box sets can duplicate units you already own and take up more space. Expansions are targeted but may leave you with an incomplete force if you only buy characters. Audit your collection first; buy the option that fills a real gap without overcrowding your shelves.

Examples from our shelves

• Warhammer 40,000 Leviathan Termagants HJI-16: Secondhand product, sold as-is, final sale. Originally part of a larger box set, now available individually. If you missed the box set or only need this unit, you can get it at a lower price without buying the whole box.
• Astra Militarum: Krieg Lord-Marshal Dreir: Multipart plastic kit that builds a single character model with a sword and known for resilience in melee. This is an expansion-style purchase for existing Astra Militarum players who want a new commander, not a complete army.
• Space Marines: Primaris Apothecary: Comes as 28 components and includes a transfer sheet. Due to distribution restrictions, we can only ship this product to the United States. A single-character expansion that requires assembly and painting. Check shipping eligibility before ordering if you are outside the US.

Which should you buy?

Choose a box set if you...

• are new to the game and need a playable core force
• want the best cost per model or component
• enjoy assembly and painting as part of the hobby

Choose individual expansions if you...

• already own the core game and need specific units
• have limited storage space or time for large projects
• want to tailor your army without buying duplicates

There is no single right answer, but your collection and play style should guide you. Start with a box set if you need a foundation, or pick individual expansions to refine what you already have. Either way, buy with a plan, and you will get more value from every purchase.