Walmart offers the Stanley 12" Universal TV Top Shelf for $15.88. Opt for in-store pickup to dodge the $5.99 shipping charge. (Home Depot and Amazon have it for the same price.) That's tied with our mention from two weeks ago and the lowest price we could find by $4. It mounts to the top of your set and features a non-slip surface, locking tab, and steel construction.

Update: The Walmart item is no longer available at this price; however, Home Depot and Amazon still have it for $15.88 with pick up and free shipping for Prime, respectively.