ninoc
I would advise against this..
I have family in Spain and they find that cars are more expensive there than in the UK. In fact they have several friends who have travelled to Germany to buy cars and have driven them back.
If there is a car being advertised at an unbelievable price, I have a feeling this is a con.
If you are interested why don't you get a cheap flight and travel out to have a look. You could always ask a local mechanic to check the vehicle over for you.
I doubt that you will have any protection if you purchase the car via the internet from such a company. By raising the question on this forum, you are already suspicious and I think this is wise.
Huckster