Besides, if you want a Jasper, have to go hunting in a brick store anyway I suppose.
Depending on the area they are pretty common. I found bunches of Jasper Arcades in the Philly area at Best Buy and Target. As of last week I didn't see any Pros (but I stopped looking since I made my own).
I heard that you can plug in a USB drive to a PS3 but I don't know about an Xbox. Have not tried it - too busy playing Call of Duty.