Walmart offers the Radio Flyer Kids Little Red Toy Wagon, model no. W5, for $14.97. (Amazon charges the same with free shipping for Prime members.) Opt for in-store pickup to dodge the $6.78 shipping charge. That's tied with last week's mention and the lowest total price we could find by $5. It measures about 14" x 8" x 6" and features a steel frame and no-scratch edges.
Update: It's now sold out at Walmart; however, Amazon still offers it for $14.97 with free shipping for Prime members.