I have several VCRs I picked up at thrift stores for a few bucks. The interesting thing is the fundamental mechanism in them is all the same. The electronics boards change, the box changes, but the machine is the same. I'd swap parts from one brand to another to keep them working.
Another interesting thing is the size of the circuit board kept shrinking!
The usual failure mode of a VCR is the recording head gets dirty. It takes remarkably little dirt to render it non-functional. A bit of alcohol applied brings it back to working order.
I've noticed that the prices of VCRs in the thrift store hit a low of $5, but have been relentlessly creeping up. They're $25 now, and are rarely in stock. Get 'em while you can. Transfer your old family tapes to mp4 while you can.