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!"
Yeah, and don't forget to remind your friends that if they have any issues with stations, to try re-scanning. Unfortunately that's not something that's been mentioned often, and it's going to need to be done by pretty much everyone, since a lot of stations are moving their digital signal to where their analog is/was.