I also want to know that.
Last time i called staples, but the CSR said if I wanted to use $40 off coupon, I must have bought it from online. And then pricematch it by email.
I was not sure that whether they pricematch with before $40 off price or after $40 price. If they pricematch with before $40 price, it's a deal. Otherwise, there is no deal.