The Nokia Lumia 521 is the best cheap smartphone with Windows Phone 8 on the market, and while it lacks a 4G LTE radio it is available for as little as $70 with no contract and T-Mobile's 4G LTE network is small as it is.
Users get a 5MP camera and a 4-inch screen packed into a curved plastic body. The phone uses a 1GHz processor and only supports 78GB of internal memory, but there is a Micro SD card slot to expand this up to 64GB more. The camera is only capable of 720P video, while most smartphones are able to record 1080P right now.
Walmart sells the Nokia Lumia 521 for $69.99 on T-Mobile's pre-paid network. T-Mobile sells the Lumia 521 for $102 or $0 down with $4.25 a month for 24 months.