I was tempted by a certain type of microlight at a 'bargain' price. I tried the web address of the 'vendor' and found it didn't exist so informed the magazine where I had seen the ad.
They came back with 'disregard, it's a scam'.
Apparently the advertiser doesn't own the aircraft; he asks for a deposit before you go and see it and thereafter cannot be contacted.
However in this case, I did get an e-mail reply saying he worked on an oil rig and wasn't on the mainland too often.