A dash cam is one of those things you hope you never actually need. It records what happens in front of you and behind you, which is a lifesaver if someone bumps your bumper in a parking lot or cuts you off on the highway. Aside from the initial cost, these are cheap to run since they just plug into your cigarette lighter or USB port.
Prices usually dip during major retail sales events like Black Friday, Prime Day, or holiday weekend blowouts. If you track the price for a few weeks, you can usually snag a solid $200 unit when the markdowns hit.
That 15-month intro window is a deadline, not free money. If you have a balance left when those 15 months are up, the bank will start charging interest on the remaining amount, which can get expensive fast.