Walmart offers the refurbished LG Sunrise 4GB Android Prepaid Smartphone for Straight Talk, model no. STLGL15GP4P, bundled with a Straight Talk $45 Text, Talk, and Web Access 30-Day Service for $48.60 with free shipping. That's $21 under buying a new phone with the 30-day plan separately. It features a 3.8" touchscreen, 1.2GHz dual-core processor, 3-megapixel camera, microSD card slot (4GB card included), Bluetooth, and Android 4.4 (KitKat).
A 1-year warranty applies, but it's unclear who backs it.