T-Mobile continues to offer a selection of its T-Mobile Prepaid Phone SIM Card Activation Kits for $10. Apply coupon code "SIMDEAL" to cut the price to 1 cent. With free shipping, that's tied with our mention from three weeks ago as the lowest total price we've seen for any of these cards. (It's also a current price low by at least $6.) These kits allow you use compatible unlocked phones on the T-Mobile network.

See all T-mobile Coupons.