Fridge is leaking refrigerant, do I have to buy a new one?

I wouldn't give up on the salvage unit yet...

Just because there isn't one on Craigslist today doesn't mean there won't ever be one. Listings are added daily.

You've got lots of time between now and next spring to look.

You just have to keep your eyes open. Maybe check a couple times a day. Maybe expand your search to other nearby craigslists.