At Discount Tire Direct via eBay, get $50 to $100 off a set of four Cooper 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 yields all-time lows on most Cooper Tires sets. The coupon code is limited to two redemptions per account. Deal ends October 28. A few best bets, with prices after coupon and rebate: