Walmart offers the Samsung Galaxy J1 Luna 8GB 4G LTE Prepaid Smartphone for Straight Talk for $29.99. Opt for in-store pickup to avoid the $5.99 shipping charge. That's $70 off and the lowest price we could find. It features a 4.5" HD touchscreen display, 1.2GHz quad-core processor, 8GB internal storage, 5-megapixel rear-facing camera, 2-megapixel front camera, WiFi, Bluetooth 4.1, microSD card slot, and Android 6.0 OS (Marshmallow).