Just a few years ago I had a 30 year old sears garage door opener. That thing worked great, but the plastic gear stripped out. I called the sears number on the "call for service sticker", gave them the model/serial number, within 5 minutes they confirmed the part was in stock, and I had it in two days for around 5 bucks. Sure beat 200 bucks for a new garage door opener. I had super heavy wood garage doors.
I don't know if they still offer that kind of service, but at the time I was really impressed.