Here's a couple of different ways that I've stored my acrylic stamps. This is when I didn't have too many. I just stuck them in a smaller cd holder. But then I graduated to this, plus I found it at a thrift store for only $2. I know it's not pretty, but it does the job, and it holds so many!!!
I've known of others to just keep their stamps in the original packaging or even to put them in page protectors or in cute little baskets. There's tons of different ways to store them.