Walmart offers the Intex 3-watt LED Pool Light, model no. 56687WL, for $29. (Amazon charges the same, although it's on backorder.) Choose Site-to-Store pickup to dodge the $7.97 shipping fee. That's $1 under our mention from last summer and the lowest price we could find. It can attach to the wall of most above-ground pools and plugs into a 110-volt outlet.