Walmart takes up to 67% off a selection of rollback cell phones. Choose in-store pickup to dodge the $5.97 shipping fee, or bag free shipping on orders of $50 or more. A couple of best bets:
LG Rebel 4G LTE Prepaid Android Smartphone for Straight Talk for $49.99 + pickup (pictured, $30 off)
Apple iPhone 5S 16GB Prepaid Phone for Total Wireless for $149 + $0 s&h ($301 off)