Your car is likely one of your biggest monthly bills. Between the gas, the insurance, and the oil changes, it feels like it never stops asking for money. The cabin is where you spend your time, but factory seats take a beating from coffee spills and sun damage. Mid-summer is the best time to find a deal on covers because shops are trying to hit their mid-year numbers.
You should negotiate the price of the leather kit as a standalone item. Once you settle on a price like $400, you can look at your payment options. The Discover it® Cash Back offers a 0% intro APR for 15 months on purchases and balance transfers, which lets you spread out the cost.
This 15-month window isn't free money; it's a loan that expects to be paid. If you still have a balance when the intro period ends, the remaining amount will start accruing interest at the standard variable rate.