T-Mobile: Samsung Galaxy On5 Smartphone, Plus $100 Prepaid Refill Card and SIM Starter Kit for $100.00 shipped. Here is a screenshot for reference. Note that the phone itself will work on T-Mobile whether it is a post-paid plan or prepaid plan. This is a pretty good way to start a prepaid plan as the phone and the starter kit are essentially entirely free. Or, if you are already a T-Mobile prepaid plan customer, the refill card can be used to pay for the prepaid plan at face value, which means you are basically getting the phone for free.
This deal has expired as it is no longer available. Congratulations to those able to get in on it.