Walmart offers the Fisher-Price Royal Stepstool Potty in Pink, model no. W4106, or Green, model no. W4119, for $16. (Amazon has it for the same for Prime members.) Opt for in-store pickup to avoid the $4.97 shipping fee. That's the lowest price we could find by $4. It features a removable bucket, seat ring that can be attached to an adult toilet, built-in handles in the seat, removable deflector, non-skid feet, and music and sound effects.