Thru Tuesday, March 12th, there is a B1G1 30% Off deal on Prepaid Airtime Cards online at Target.com. This discount is only available for e-mail delivery and is valid on AT&T, Cricket, Tracfone, and T-mobile prepaid air time.
But also keep in mind- when you use your REDcard at checkout either online or in stores, you will get an additional 5% Off your purchase. So for example if you buy two $10 Prepaid Airtime codes for a total of $20, you will pay as low as $16.15 for both after the B1G1 30% Off & 5% REDcard discount.