Microsoft is selling the Nokia Lumia 520/521 (AT&T and T-Mo) phones again for $59 (AT&T) and $69 (T-Mo) off-contract prices. This does not mean 'unlocked'. They are still locked to that carrier. Also remember, that these phones are upgradable to the latest updates to the phone, but due to limited hardware, may not get all the features. (Same with apps. Some apps require 1GB of RAM. These only have 512MB.) Still, these little phones are great starter phones and for the price, you can't complain. Only thing close would be the Moto G on Verizon for $99.
Link: http://www.microsoftstore.com/store/msusa/en_US/list/No-Contract-Windows-Phones/categoryID.63434300?WT.mc_id=PromoEmail_NoContractPhones_OnlineBM_1-7-14_Hero_ShopNow
Link: http://www.microsoftstore.com/store/msusa/en_US/list/No-Contract-Windows-Phones/categoryID.63434300?WT.mc_id=PromoEmail_NoContractPhones_OnlineBM_1-7-14_Hero_ShopNow