You have to look for it harder on the T-Mobile site for the $30 100 Minutes / "Unlimited Data" monthly pay-as-you-go.
http://consumerist.com/2013/06/07/t-mobile-has-a-30-unlimite...
http://consumerist.com/2013/06/07/t-mobile-has-a-30-unlimite...
http://www.walmart.com/ip/T-Mobile-SIM-Kit/24099996
http://www.walmart.com/ip/Tmobile-30-Wireless-Airtime-Card/1...