OK, sorry, I'm not in the US. This is my Finnish provider's basic plan if you don't want to buy minutes in advance:

SIM card 1,99e/month.
Calls 0,079e/minute if you use them.

Data (/month):
384 kbps: 9,9e
512 kbps: 14,9e
1024 kbps: 19,9e
2048 kbps: 29,9e