T-Mobile offers its T-Mobile 3-in-1 SIM Starter Kit for free via coupon code "FREESIM". Also, free shipping applies. These SIM cards allow you use compatible unlocked phones or tablets on the T-Mobile network. Qualifying service is required. Deal ends October 31.
T-Mobile offers its T-Mobile Prepaid 3-In-1 SIM Starter Kit for $20. Coupon code "SIM99" cuts it to 99 cents. With free shipping, that's tied with our mention from March as the lowest total price we've seen. (It's $4 under the lowest in-store price we could find.) It allows you to use compatible unlocked phones on the T-Mobile network and includes a nano SIM card with micro and standard adapters.