Best Buy is where I got mine... ~$100 for the Wacom Bamboo Pen & Touch. But I reeeally want one with a screen... which means $1k (at least...), or actually $2k for the model I want T^T Wacom Cintiq 21UX... Sigh. It'll be a few years before I can get that
Ah well.
And yeah, you can get the Bamboo Pen tablet for ~$70, which is good for drawing. There's also the Bamboo Touch for the same price, but it doesn't have a pen (as you might guess by the lack of "Pen" in the name), so tricky for drawing.