Heavy-duty aluminum roof racks turn your car into a hauling machine, letting you carry kayaks, boards, or extra cargo boxes without cluttering your interior. They cost about $350 for a quality set, but they are built to last for years if you choose the right material and mount style.
You want to shop during the big seasonal sales in May when outdoor retailers clear out winter stock to make room for summer gear. Prices drop here, so you can often grab a premium set for less than the usual sticker price.
That 18-month window is a deadline, not free money. If you don't pay off the full $350 before the intro window on purchases ends, you will start paying interest on whatever remains, which eats up your savings fast.