I use this. Works great. Rick Broida:
T-Mobile offers a free 200MB-per-month data plan to anyone with a compatible tablet. I don’t mean “free if you’re already a T-Mobile customer” or “free with your existing smartphone plan” or “free not including several dollars in taxes and fees, not to mention whatever overage charges you’ll almost certainly incur.”
I mean free. No strings attached, no credit card required, no b.s.
You will need to setup a T-Mobile account and 200MB per month isn’t much, but free is free.