That really sucks! I had the same thing happen when I was first looking for a bus. I drove from LA to Bend Oregon to check out a '36 Chevy shorty, agreed to pay the asking price, was assured the bus would be there when the hauler showed up. Glad I checked before I dispatched the hauler--the A$$ hat sold it out from under me.
The good news: I bought my present bus sight unseen on ebay. When it arrived I found it to be in much better condition than the seller had said!
Here's hoping you have similar luck!