Your car's interior takes a beating from dirt and spills, but custom molded mats act like a shield. They hold the mess in place so you can just pull them out and hose them off, keeping your resale value higher when it comes time to sell.
Manufacturers usually drop prices or offer rebates during seasonal sales events, especially around holidays or the start of a new model year. Watch the official site for these promos to grab the best deal on a full set.
Remember that the intro window is a deadline, not a gift. If you still have a balance after the 18 months are up, the bank will start charging interest on the remaining amount.