Finding Coupons for Online Merchants

I've gotten into the habit of a quick and simple routine to save on online purchases. If I see something I'd like to buy, besides comparison shopping, I type "coupon codes" into google along with the name of the merchant (e.g., Home Depot Coupon Code). Usually, several websites come up offering coupons if there are any circulating on the net. If not, you might want to save your purchase for another day or try a differnt website.