No more digging for keys in the rain or wondering if the back door is locked while you are in bed. Swapping three or four exterior deadbolts for smart locks takes an afternoon with a screwdriver, and you can control your entire perimeter from your phone. Late November through the December holiday tech sales is prime time to buy multipacks, which usually run around $500 total.
If you prefer not to install them yourself, get at least two or three quotes from local handymen or locksmiths before buying hardware. Labor can swing wildly depending on door alignment, but spreading the hardware purchase itself makes the upfront bite practically disappear.
That 18-month window is a strict deadline, not free money. If you carry a balance past the 18 months from account opening, regular interest kicks in on whatever is left, so stick to the $27.78 monthly plan and pay it off on schedule.