Retail like walk into the store and buy one? No.. you need one with a voltage regulator in it and most of the cheap "off the shelf" units dont have that.
Here's 3 units you can order.
http://forums.motionbased.com/smf/in...35246#msg35246
Well, Motorola makes a unit for the RAZR phones that might work but I dont know it it's USB standard or not. Let me find a link and Ill stick it in this post.
http://www.bestbuy.com/site/olspage....=1158316637834
I dont know if its a USB standard device or not so you're on your own there. It was mentioned on the Motionbased forum a few months ago but no one ever bought one to test and reported back.