For in-store pickup only, Walmart offers the Intex River Run I 53" Inflatable Tube Lounge for $12.88. That's the lowest price we could find by $4. It features a backrest, two cup holders, mesh bottom, grab line, and two air chambers for added safety.
Note: Although the image and product headline indicate the color as red, the product details say it is white/blue. It's unclear which color you may actually get.