You are buying a machine that sits on your counter for the next decade, pulling daily shots so you stop spending six bucks a commute. We want you to buy the right piece of hardware once, rather than cycling through two cheap ones that break.
Watch the release cycles closely because fall and winter holiday sales are when brands clear out last year's models. That older machine has the exact same brass boiler and rotary pump you want, just at a steep discount.
That 18-month window is a hard deadline, not free money, and if any balance is left when it ends, interest hits the original purchase amount from day one.