Winter brings dark commutes, snowstorms, and roads where you honestly can't see the lines. Upgrading to a full LED headlight and fog light setup makes a massive difference in visibility, but buying a quality kit all at once hurts the wallet. A typical setup runs about $600, and winter holiday sales are usually when parts prices dip the lowest.
You should negotiate the price of the parts and any installation help before you even think about how to pay for it. A financing window is just a tool to smooth out the cash flow, not an excuse to buy something you can't afford. Let's look at how to get those lights on your car without wrecking your budget.
Just remember that the intro window is a deadline, not free money. If you still have a balance left on the Citi Simplicity® Credit Card when those 18 months are up, interest will kick in on the remaining amount.