CostPal alerts shoppers when Costco purchases drop in price, making it easy to claim refunds through Costco's price adjustment program. Costco can save you a lot of money—as long as you don't leave with a kayak, a giant teddy bear, and a 72-pound wheel of Parmesan cheese you never intended to buy. What many Costco shoppers don't realize, though, is that Costco has a 30-day price adjustment policy. If something you buy goes on sale within 30 days, Costco will refund the differ