The Bay of Evils is not the best place to fins a coffee machine bargain.
Unless its local so you can inspect it (preferably running) I think its too risky.
My son works for an auction house that moves many machines but he has no idea of whether or not they work.
Occasionally they will conduct an auction on site when liquidating a cafe but those situations are not common and I dont think theyd like punters playing with the lots in case they dmaged them.
If you are able to al least inspect a machine externaly, the best I think you can hope for is a bargain on price in case theres al ot of work to do on it.