This AT&T Go Phone Nokia Lumia 520 drops from $99.99 to $84.99 with free shipping at Tiger Direct. This is the best price we could find for this prepaid smartphone by $15. It runs Windows 8 OS and has a 4" touchscreen, 1GHz dual-core Snapdragon procesor, 8GB of storage that can be expanded with a MicroSD card, a 5MP camera and more. This is a locked, pre-pay phone that does not require a 2-year contract. There is no sales tax (except FL, IL, NC, TX, GA, SD and ID).