BuyDig via eBay offers the Samsonite Cruisair DLX 21" Hardside Luggage Spinner in Blue, model no. 67117-1090, for $135 with free shipping. That's $4 under our May mention and the lowest total price we could find by $13, outside of the mention below. It measures 21" x 14.5" x 9.5" and features a retractable handle, cross straps, spinner wheels, and TSA lock.
A close price: Amazon has it in Blue for $138.28 with free shipping.