eBags via eBay offers the Traveler's Choice Pacific Gear Gala 20" Carry-On Travel Duffel Bag in four colors (Black pictured), model no. PG03052, for $29.99 with free shipping. That's the lowest total price we could find by $6. This 20" x 12" x 11.75" bag features a retractable handle, recessed wheel system, one front pocket, and two side pockets.