For me, seems like all months... I feel I always get the $75 off coupon, never seems like the sale ever ends. I would look around through, I felt I paid a high price at Costco (good tires and good service) and when I went to get them warranted (wore out fast, alignment was good) I was able to buy a full set of 4 for barely the cost over the prorated two. May be worth looking around, but I know many are happy with the service there and price.