Walmart offers the Evenflo Big Kid Sport Booster Seat in Jake Black, model no. 31911572, for $24.88. Opt for in-store pickup to dodge the $4.97 shipping fee. That's the lowest price we could find by $25. It features a removable back for transition to a no-back booster, height adjustment, and two elastic cup holders. It's recommended for children up to 110 lbs. and 57" tall.