Cars are money pits. Between insurance, gas, and registration, just keeping your ride parked costs a fortune. But if you don't want your cabin smelling like wet dog and mildew all winter, you need rubber mats before November hits. Dealers charge way too much for these, and late fall is when everyone else scrambles to buy them, which drives up retail prices.
When you buy a car, negotiate the price of the vehicle itself separately from the financing. A card window is for the deposit and the extras, not the whole car. If you already own your ride, don't put accessories on a high-interest store card. We can use a smart financing window to grab the mats now and pay them off slowly.
Keep in mind that this 18-month window is a hard deadline, not free money. If you still have a balance left when the promotional period ends, the standard variable rate will kick in on whatever is left, ruining your math.