Update: No longer available for shipping, but still available for store pickup (availability varies by location).

Babies R Us has Volkswagen Beetle Booster Seat (Yellow) for $14.98. Shipping is free, otherwise free store pickup is available if stock permits.

Alternatively, Toys R Us via eBay has Volkswagen Beetle Booster Seat (Yellow) for $14.98. Select free store pickup if stock permits.