Walmart offers the Muskoka Ashby 58" Media Electric Fireplace in Black for $307.50 with free shipping. (Home Depot charges about the same.) That's the lowest price we could find by $203. It accommodates TV's up to 65" and features a 4600-BTU fan, three flame brightness levels, thermostat, and auto shutoff.

Update: It's now out of stock at Walmart; however, Home Depot offers it for $307.41 with free shipping.