I just discovered "Futurlec":
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They have a really impressive selection of boards for various purposes. A lot of them are small and specific, like a switching regulator board (was looking for that a couple weeks ago!) for $6, an audio board (including amplifier and speaker -- was looking for a couple days ago) for $6, an MP3 board for $21, etc. I also like their "ET-ARM Stamp" board, which has an ARM processor, 4 A/D inputs, 6 PWM outputs, comes with a bootloader preinstalled so no programmer is needed, and of course a Stamp form factor, for $25. Pretty slick. (There's a nice carrier board for it for $23 too.)
I don't actually know how new these guys are, but I'd never heard of them before today, so maybe you haven't either. Well worth a look if you haven't already.
Note that I'm not associated with Futurlec, and haven't even used any of their products yet. It's possible the actual boards are junk. But I certainly like what I've seen of their selection so far.
Cheers,
- Joe