VMInnovations offers the Bestway 15-Foot Fast Set Inflatable Above Ground Swimming Pool, model no. 57290E, for $239. Coupon code "AEMRGQP" drops it to $199.99. With free shipping, that's $200 off and the lowest total price we could find. It features a DVD with setup instructions, PVC double-layer lining, polyester 3-ply wall filling, 800-gallon filter, and ladder. Deal ends May 31.
Note that an air pump is required for inflation.