A good 3D printer bundle gets you printing right out of the box without needing extra parts, and a solid machine should easily last you several years if you take care of it. Brands usually drop new models in the spring, which means late November sales are the exact right time to grab last year's proven version at a real discount.
We want you buying this once instead of replacing a cheap machine in six months. Let's look at how to time the purchase and handle the payments so you don't take a hit all at once.
Remember that the intro window is a deadline, not free money, and any leftover balance will suddenly get hit with regular interest if you don't pay it off before those 15 months run out.