For those miniatures which don't come with a base, I make my own. If you have a sander and a saw of some kind, you have all the equipment to make these bases. The miniature shown in the picture of the G'nort Dire Wereboar on the right uses one of these bases.
All you'll need to buy is a 1" diameter dowel. I use oak, which is durable and attractive.
You can pick one up at Home Depot for around $4 for a three foot (approximately 1 meter) oak dowel. Each base only takes about one centimeter of lengh off the dowel, so you get a lot of bases for not a lot of cash.
If you don't have a sander, you can still make these bases. You just won't be able to round the top.
Review the safety tip to the left before proceeding.
To create a rounded "button" profile, you need a sander (or sandpaper and a lot of patience). Hold your dowel at about a 45 degree angle to the moving sandpaper and touch the top edge of the dowel to the sander.
Rotate the dowel at a steady pace, so you're rounding the top of the dowel as you go. As you rotate the dowel, try to maintain the same angle of the dowel against the sander.
Proceed all the way around the circumference of the dowel, keeping even pressure against the sander. Naturally, uneven pressure against the sander will produce uneven removal of wood during sanding. The harder you press or the slower you rotate the miniature, the more wood you remove.
Depending on how rounded you want the top, you may want to go around once or twice more. There's no "right" amount of wood to remove. It's your mini, so you only have to please yourself.
These first passes over the sander create a beveled edge, which you may like. If so, don't sand any more before slicing the miniature from the dowel.
If you'd prefer a rounded, "button" look, change the angle of contact between the dowel and sander to around 60 degrees from perpendicular. Sand all the way around the circumference of the dowel again, as you did before.
Now change your angle to about 30 degrees from perpendicular and repeat the process.
I use a bandsaw to slice away the thickness I want for my bases, but you can use a handsaw. I tend to slice mind about a quarter of an inch to a centimeter thick.
Hold the dowel with a vise while slicing off a miniature base. As with any other project where you use tools which can cause injury, use safety best practices suggested by the tool manufacturer.
Depending on the type of sander you use, the kind of dowel, and how aggressive the sandpaper you use, you may see some amount of burn on the surface of these bases.
To remove this, either use a less aggressive sandpaper in your sander or you can remove this by hand with sandpaper.
If you will cover the top portion of the base, you probably won't need to remove the burn marks.
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If It looks like too much work to make bases yourself, these Reaper miniature bases work great, and don't cost much for 25 of them.