You can buy pretty much anything at Costco, from laundry detergent to a massive barn shed — so it's not surprising that the wholesale retailer also sells a lineup of hot tubs, ranging from $500 ...

Small tubs (about 3.2 cubic feet) can wash up to 14 pounds of laundry, or roughly nine thick, full-sized bath towels. Medium tubs (about 4.5 cubic feet) can wash up to 16 pounds of laundry ...