Walmart offers the LG Lucky 4GB Prepaid Smartphone for Straight Talk, model no. STLGL16CPWP, for $19.82. Opt for in-store pickup to avoid the $4.97 shipping charge. That's $10 off list and the lowest price we could find. It features a 3.8" LCD touchscreen, 1.2GHz dual-core processor, 4GB microSD card, 3-megapixel camera, WiFi, Bluetooth 4.0, Android OS 4.4 (KitKat).