Walmart offers the Microsoft Lumia 435 No-Contract Prepaid 4G Windows Smartphone for T-Mobile in White for $29.99. Opt for in-store pickup to avoid the $5.99 shipping charge. That's the lowest price we could find by $9. It features a 4" 800x480 LCD touchscreen, Qualcomm Snapdragon 200 1.2GHz dual-core processor, 1GB RAM, 8GB storage, Bluetooth 4.0, GPS, and Windows 8.1 with Lumia Denim OS.