Walmart offers the refurbished TCL 55" 4K Flat LED Ultra HD Roku Smart TV, model no. 55S405, for $259.99. Opt for in-store pickup to drop the price to $257.36. That's $40 under last month's mention of a new unit and the best price we've seen. (It's a low by $93 for a new unit today.) It features:

3840x2160 (2160p) native resolution

content streaming via Roku TV (including Netflix, Youtube, and Hulu Plus)

802.11ac wireless

USB and three HDMI inputs

Note: A 90-day warranty applies, but it's unclear who backs it.