Let the hive mind of Engadget get that for you.
"As someone who doesn't reside in the USA, I was wondering what would be the best way to get internet for my computer in the US for a couple of weeks? If it were Europe I know I'd look for some prepaid data. Is there anything similar offered by American carriers? A MiFi or a data SIM that I can tether from would work, but I'm trying to maintain a tight budget. Help!"
Why not add like, a watch function? You can wear it as a watch with a slightly thick wristband, and it charges your mobile devices. Or add spikes. Or wear it around your feet, harder to see, and more movement.