That's right! T mobile offers 200mb/mo data for life on
Any cellular iPad new/old. Granted 200mb won't get you very far streaming music... But checking emails, using apps on the go, it's pretty decent.
By default it will shut off when you reach 200mb, but of course they'd be happy to take your money if you want more (let's say you're on vacation one month and use more than normal)
For that matter, I don't think most cell companies charge $30/mo for iPad cellular. Att is my cell phone carrier and it would cost $10/mo if I wanted to add an ipad to my plan. And I believe they even have an option where you can just pay as you need it.