Walmart offers the Huawei Ascend Y Prepaid Android Smartphone for Straight Talk, model no. H866C, for $9.99. Opt for in-store pickup to dodge the $4.97 shipping fee. That's $18 under the lowest price we could find for this phone on any network. It features a 3.5" touchscreen display, 800MHz processor, WiFi, 3-megapixel camera, microSD card slot, and Android 2.3 OS (Gingerbread).
Note: This phone will only work with the Straight Talk $45/30-day Unlimited Service Plan or the $60/30-day Unlimited International Service Plan.