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!"
Too expensive. May have a chance once they get down to $400 or so..
In most cases, the few buyers will be those who are willing to pay for both a laptop and one of these. Otherwise, usually a laptop for approximately the same price will be chosen.