Best Choice Products via Walmart offers the Greenhouse 15-Foot Walk-In Tunnel Greenhouse in Green for $114.94 with free shipping. ( and Amazon charge the same.) That's tied with our April mention, $135 off, and the lowest price we could find. It measures 15 x 7 x 7 feet and features eight roll-up windows and a zippered door.

Update: The price has dropped to $107.69.