I just wanted to pass along some info to those who might want it. I recently picked up a usb powered fan and Wally world and after using it for a month, can say I really like it.
Its about 5" tall and 2" thick, the fan tilts up from the base so you choose different angles and its really quiet.
I use it to sleep with and it puts out quite a bit of air while being pretty quiet. I don't know how many watts it pulls, but the power supply that came with it is only 500ma, so can't use too much.
I think it was less than $10 and I would buy some more of them for sure.
Randy