Walmart offers the Spalding NBA Slam Jam Over-The-Door Mini Basketball Hoop, model no. 56099, for $25. (Amazon charges the same with free shipping for Prime members.) Opt for in-store pickup to dodge the $4.97 shipping charge. That's the lowest price we could find by $10. It features a polycarbonate backboard, breakaway rim, and 5" Spalding rubber basketball. Deal ends March 20.