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!"
This sounds similar to my plan for electric-bill domination: get 3KW of solar output; attach thermostat to light sensor next to panels; when there's 3KW of free power, set thermostat to 65F; at night and during rain, live off the charge of cool air put in the house during the day.