dhenry:
Here is an example: Apple 5W USB Power Adapter - Apple
I just upgraded my cell phone to a Samsung Galaxy S-II, and the phone came with a similar charger, that at 5v and 2a provides more juice than the normal USB wall warts I've had in the past (usually 0.5a). I like this wall wart because it takes no extra space in a normal power strip. Also, I was looking to bring up my Raspberry Pi, and I needed at least 1a for that. I did some looking on ebay, and found some similar power supplies:
- From china, $3.99 + $0.99 s/h: http://www.ebay.com/itm/350610125612?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649
- From USA, $5.99 + free shipping: http://www.ebay.com/itm/160893728603?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649