Grab a flyer right when you walk in!
Sign up for their emails, ProXtra, and their Garden Club. Get approved for their credit card; many coupons are available exclusively to card holders using their cards to make purchases.
Google "Home Depot coupons", or search their website. Lastly if making a purchase online for in store pickup you can use the Honey browser extension to get coupons automatically. Best wishes on your quest.
Thanks! Your answer is awaiting moderation.