Target with VM Express has the Bestway 54284E Portable Standard 6.5 Foot Payload Pickup Truck Bed Swimming Pool for $85 with free shipping. REDcard holders (sign up) get an additional 5% off in cart. Amazon with Kalernafe has it for the same price (1 left in stock/86% seller rating).
Fits standard truck beds up to 6.5 feet in length.
$85 retail: $146Report