They had a whole stack in the Works on Princes St in Edinburgh a couple of months ago, including some very expensive looking cars (can't remember what model they were). I was very tempted to get them just to paint them up as post apoc wrecks

However, I refrained and just picked up a couple of Range Rovers and some other normal town car instead.
If you do plan to take them apart, be aware that they are attached with 1.5mm triangular torq screws.
They're some old d'Agostini line, so it may be possible to track them down via that route. However, The Works is one of the places where old stock goes to die, so they're probably long out of prodution.