Clearance start dates and markdown depths for patio furniture, grills, holiday decor, Halloween, winter coats, snow blowers, air conditioners, pool supplies, school supplies, swimwear and gardening at Target, Walmart, Home Depot, Lowe's, Costco, Amazon, Macy's, Kohl's and the others, the historical best week to buy each category, end-of-model-year sales on mattresses, TVs and appliances, retailer clearance policy and markdown schedule changes and price-history confirmation that a clearance price is a real low, with the category or retailer first and the markdown in the title.