I have used the coupons on sale items before. Actually, every time I go to Harbor Freight I always have a coupon in my e-mail. I just pull it up on my phone and have them key in the coupon code. Sometimes they grumble a bit, but I've never been denied. And with as often as they send out the 20% and 25% off coupons, I never have to scroll too far in my deleted e-mail folder to find one. They frequently have Nitrile gloves on sale.