Need help finding an engine

Got a Vulcan 500 a couple days ago for free and found out it needed an engine. I haven’t been able to find one anywhere besides online but who knows if they even show up working and I just spent mine on it. Does anyone have any suggestions? Also I’ve already called multiple places that either can’t source one or will only source one if they can put it on. Also don’t have any local junk yards either any available.