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I've also heard them referred to as "sockets." Fancy ones can get pretty pricey, as they use quality (or even exotic) hardwoods. Most people tend to use cheaper options, like the pine plaques you find in craft stores. You can get them in all shapes and sizes, but the quality of the wood used tends to make finding a decent one a bit trickier. I rifle through the bins whenever I'm shopping at Michaels and grab a good one, if I find any - they're cheap enough that it's worth getting it while I can, in case of future projects.
Finding glass domes to top them might be tricky. If you want them individually covered, I'd say just buy an actual display case - they have finished bases, anyway. Reasonably small ones aren't hard to find or terribly expensive. Baseball cases are common and fit anything up to Dreadnought size, if they don't have really tall banners on top.
You can also build your own rectangular base and pop a frame around it, if want a particularly fancy edge that you couldn't get out of the routed edge of a plaque. This works particularly well for bigger dioramas and display boards. As long as you stick to standard proportions, you can get anything up to 24"x36" right off the shelf.
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