Walmart offers the Fisher-Price Healthy Care Booster Seat in Green/Blue, model no. V8638, for $16.88. Opt for in-store pickup to avoid the $4.97 shipping charge. That's the lowest price we could find by $10 in any color, although we saw it for a buck less last year. Designed for children up to 45 lbs., it features an adjustable, dishwasher-safe tray, shoulder strap, and two safety straps.