Walmart offers the Little Tikes Lil' Ocean Explorers 3-in-1 Adventure Course for $24.99. (Amazon offers it for the same price with free shipping for Prime members.) Opt for in-store pickup to avoid the $5.99 shipping charge. That's the lowest price we could find by $35. It features a submarine play station, underwater playstation, and an octopus play station with over 20 sounds. It requires three AA batteries, not included.