A good smart video doorbell keeps an eye on your front step for years, so you want to buy the right one the first time instead of replacing a glitchy model in twelve months. Look at what you actually need, like crisp night vision and reliable motion alerts, without paying for extra features that just drain the battery.
Tech companies usually drop new models in the fall, which is your cue to look for bundle deals on last year's version. You get the exact same core performance and weather resistance, but you save real money because the maker wants to clear out old stock.
Remember that the 0% intro window is a strict deadline, not free money. If you still have a balance left when those 18 months are up, you will get hit with interest charges on the remaining amount.