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!"
I wouldn't be surprised to see an AirPort update next week. I was at my local Apple Store this past Saturday and the "refreshed table" was full of AirPort Extremes, AirPort Expresses, and those Monster audio cable kits. Maybe someone bought 4 AirPort Extremes and a handful of Expresses and decided he didn't want them, but I'm just not feeling it.