Confirmed pricing errors and glitch deals at Amazon, Walmart, Target, Best Buy, Home Depot, Lowe's, Costco and the major retailers that are still live, stacking glitches that combine coupons, cashback and gift cards legitimately, clearance and markdown errors found in stores with the SKU, retailer honor and cancellation policies for price mistakes, order cancellation waves and how retailers handled them, state and federal rules on advertised price honoring, retailer compensation for canceled orders, legitimate price-match and price-drop refund windows and warnings about deals that are scams rather than mistakes, with the retailer and product first and the price in the title.