An enclosed 3D printer keeps ambient heat steady so you can print tough materials like ABS and ASA without warping. If you pick a solid core-XY machine now, it should easily last four to five years of heavy hobby printing before you need an upgrade.
Cyber Monday is prime time for tech deals, but you do not always need the absolute latest machine. Manufacturers refresh these printers every year. That means last year's top model usually drops near the $650 mark while delivering almost identical speeds and quality.
Remember that a 0% intro period is a strict deadline, not free money. If you still carry a balance when the 18 months run out, interest kicks in on whatever is left. Pay it off on schedule so your Cyber Monday deal stays a deal.