Need pay-as-you-go sim with lots of data for travel while in U.S.

Anyone know of a company or somewhere I can buy a sim card for use in my iPad2 and buy pay as you go data, 2gb at least per month with no commitment while I travel in the U.S. from Canada? Does such a plan exist, if so, how much per month and where do I go to get this?
Thanks!;D

I'm assuming the iPad 2 you have has cellular capability.

In the US as far as I know, you're limited to either AT&T or Verizon. Verizon charges $30 per month for 2 GB with free "hotspot" service. AT&T is less expensive for 2 GB (I believe it's still $20) but without a free hotspot.

You can get a sim card from Verizon wireless or AT&T wireless stores which are scattered throughout the US.