Target offers the Evenflo High Back Big Kid Amp Booster Seat in Sprocket for $23.85. (Amazon charges the same for Prime members only.) Opt for in-store pickup to avoid the $4 shipping charge. That's $5 under our February mention and the lowest price we've seen. (It's the best today by $5.) It can convert to a backless booster seat and features adjustable height, a removable seat pad, shoulder belt positioning strap, and elastic cup holders.