Were it me I'd be looking into older models that don't have a sealed drum. Our family machine is a Bosch that must be at least 10yrs old; in which time I've done a few DIY jobs on it to keep it going for not a lot of money.
It did need a new motor (got a used, low-mileage one off
ebay for IIRC about £30) as the brushes had worn down so much that the copper pigtails were exposed through the contact surface and had scored the comm, causing a dead short
Not that I expect everyone to drag out their machines to check the brushes, but it's worth doing if you have easy access since they're cheap and easy to replace - cetainly more-so than the motor on both counts!
Much better than getting yourself in to the modern consumptive doom-loop of having to replace crap every couple of years when it's failed 10 minutes out of warranty and has been built specifically to be irreparable
