Jamming of shutter mechanism of ME Super is a common problem.
There is a good article on this issue (can't remember where but I think it's from the site called Classic Camera Repair). The jamming of shutter is generally caused by a bent steel arm in the shutter mechanism. You can get to this easily by removing the bottom plate. Don't force to cock the shutter when it's jammed - this will bend the arm more.
Getting another is your best option.
Eric is very good. He'll fix it right. I sent him an ME Super that he discovered had had an amateur repair done on it, necessitating correction of the bad work (super glue was used liberally) in addition to the obvious repair. He did not charge extra. I sent him a parts camera and lens and a few Spotmatic accessories just to show my appreciation. First time I've ever done that!
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.
15 bucks will get you another ME Super with its own problems, as often as not.
If the body is in clean shape, no dings or missing pieces or such, an overhaul by Eric will get a camera good for a long time. Known good. That'll run maybe $70? with shipping? Your call- one known solid camera, or three rolls of the dice. Now one good reason to do Ebay is to get a 'free' 50mm f1.7 SMC lens. One of the best, and often just 'thrown in' on cameras like this.