http://sellout.woot.com/
has CyberPower 4-Port USB 2.0 Hub with Rechargeable Battery Packs for $4.99 (+ $5 s/h) for the next 23.5 hours or so.

As I commented there, These are great for people with Nokia Internet Tablets who want to use USB host mode.
The tablets don't supply enough current for many devices, and the 770 even requires current pumped into it. (This is possible with this hub and some adapters, but requires a "jump start" - I used a half depleted 9v battery)