At Discount Tire Direct via eBay, get $40 to $100 off a set of four Goodyear Tires when you redeem this mail-in rebate. (Rebate valid only on select model tires.) Plus, take an extra $100 off a set of four select tires via coupon code "PTIRES18". Combined, that brings some significant price lows on many of these Goodyear tire sets.