Rolling around on a cold concrete floor with a squeaky creeper and a jack that feels a little too sketchy gets old fast. Wrenching on your own car saves a pile of money on labor, but stocking the garage with gear you actually trust still bites into your monthly cash. When you want solid tools that won't fail halfway through an oil pan drop, you need to time the purchase right so you aren't paying full retail.
Father's Day sales and Black Friday are when prices on garage gear actually soften up. If you are eyeing a set of new floor jacks and creepers for about $320, wait for one of those windows to pull the trigger. Always haggle or hunt for bundle deals first if you are buying locally, keeping your financing plan strictly for spreading out the final hit rather than paying for the whole project at once.
That intro window is a strict deadline, not free money, so treat it like a countdown. If you still have a balance left when the 18 months run out, the card will hit you with deferred interest on the original amount, wiping out all your savings.