Walmart is now offering the Huawei Ascend W1 on their Straight Talk MVNO. The handset is being sold at what now seems a rather pricy $229.80 and is only compatible with the Straight Talk $45/30-Day Unlimited Service Plan or the $60/30-Day Unlimited International Service Plan.
The handset competes with Android devices such as the $199 LG Optimus which only has an 800 Mhz processor, but of course appears expensive compared to the Nokia Lumia 521 on T-Mobile.
See the handset at Walmart here.
Thanks Arun for the tip.