Walmart offers the Fisher-Price Animal Friends Discovery Treehouse for $5.97. (Amazon offers it as an add-on item for the same price with a $25 order.) Choose in-store pickup to dodge the $4.97 shipping fee. That's tied with our February mention and the lowest price we could find by $12. It features openable doors, peek-a-boo friends, rollers with colorful beads, turnable gears, and clickable birds.