This one is interesting:
I think it could do the trick, if I could get drivers for it :-)
It is clearly underpowered with regards to the CPU, but seems to work well for most people.
On the other hand, I think I can build an A4-3400 based system which would have better video, and more expansion, in a modestly larger case, for cheap. (case w/ PSU, CPU/GPU, 8GB DDR3 mem, A75 mATX MB for $220 and < $300 w/ 500GB SATAIII HD ... microcenter and newegg components, depending on sales)
Zotac apparently has a big selection of these mini media PCs. zotacusa.com