Walmart offers the Summer Escapes 10-Foot Round Quick Set Pool
, model no. M-P21-1030-A, for $48
. Pad your order to over $50
to bag free shipping; otherwise, opt for in-store pickup to dodge the $4.97 shipping fee. That's the lowest price we could find by $21, minus the cost of padding. It features a pool pump, filter cartridge with built-in chlorinator, and inflatable top ring.