Walmart offers the Summer Waves 18-Foot Swimming Pool for $199. Opt for in-store pickup to dodge the $19.97 shipping fee. That's tied with our mention from a week ago and the lowest price we could find by $72, although we saw it last June for $20 less. It is 48" deep and includes a filter pump, cover, ladder, maintenance kit, ground cloth, filter cartridge with chlorinator, and an inflatable top ring.