If you have a large purchase that you want to make at Home Depot, a 20-percent-off coupon can help you save money on your purchase. These coupons can be hard to find, but if you look hard enough, you, too, can save 20 percent.
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Visit your local U.S. Post Office. Ask the postal clerk for a "mover's guide" packet, which is usually available for people who must change their mailing address. Look inside the packet to see if there is a Home Depot coupon for 20 percent off. The coupons alternate between Lowe's and Home Depot coupons.
Check on eBay to see if anyone is selling a 20-percent-off coupon for Home Depot. If so, you can bid on it to attempt to purchase it.
Ask around to see if anyone in your circle of friends or relatives is an employee at Home Depot or knows a Home Depot employee. If so, ask them if they can get you a 20-percent-off coupon.