Alex there are probably thousands, but in spring and summer keep an eye on the big box stores. They get different ones in all through the summer and you can pick up a nice plant for $3. They also start extremely easily from cuttings. Mine root in a glass of water in less than a week.
I have a couple going that will make it through winter, I hope. First one is Dipt in Wine (called that for obvious reasons) which varies in color depending on the amount of light it gets, and the second is Florida Sun Rose. It goes from deep green with purple in the middle of the leaves in hot weather to more mottled colors with pink and yellow when the weather is cooler. Our weather is just starting to be cool here, so it will get more colorful.
