That dealer did the dirty on me 4 years ago (that actually turned out to be favor, now having the Maser)
Went to buy an immaculate 928 GTS that was advertised for 18K.
Because of the distance from home, arranged to travelled down the day before, and saw it briefly before they closed, still with £18K in the window.
The following morning he announced to me that he had just sold it over the internet to an Australian buyer for £20K (although still was £18K on his web site).
....BUT if I paid him £20K, I could still have it!!!
I still wanted the test drive, I was in love with it, and after 3 hours waiting (yes 3), he got it out of the showroom so I could test drive it.
It had no petrol in it, so he suggested that I could put some in at the garage down the road, at MY COST!
It drove okay, but out of the showroom, it had been badly painted down the nearside with overspray in the wheel arches, and the service history was less than perfect.
I walked after that.
On the way home I asked a friend to phone up and enquire if the car was still for sale....it was.
A couple of years later I saw the same car for sale at a Porsche specialist, which again confirmed it never left our shores.
Out of interest I spoke to the specialist dealer about it, especially as he was asking £35K for it, and he was quite open saying that it was a commission sale and the owner was trying to re-coup over £20K he had spent on it in the 2 years he had owned it....so lucky escape!