You would ask Sprint or Verizon for such. I don't see such an offering today but you could expect to pay about 2 to 4 times the monthly rate of the normal service for this. The reason for such a number is about what you see for pay as you go type service.
The costs to field this service are fixed (signup costs, network etc.) So to get a monthly I'll just use it for this month and cancel will incur more fees than you would expect.
Has anyone hear of the wireless cards you put in the slot and then its prepaid you buy like minutes for it like a prepaid cell phone cause i seen some lady with one but i forgot what it was called if you can tell me where i could get one that would be awsome cause i like to travel and have internet sometimes.