I usually don’t try using coupons since many of the codes shown on websites don’t work, but I feel bad for not trying hard or smart enough. I’ve heard good things about Retailmenot, I haven’t tried it yet but I wondering if there are privacy trade-offs.
I don’t have a lot of positive things to say about AI, but in my experience they are surprisingly good at providing valid coupon codes for well known brands.
Rule of thumb, if you had to create an account, assume the company is selling your email and coupon searching data to somebody. They’re not providing the service at a loss.