Good Evening

I am a foreigner living in Greece who loves this country so much.
I am very sorry asking straight a question but I would like to
ask your advise. I saw some watches in some websites,
like car.gr and xe.gr.
Ofcourse this watch is difficult to buy from retailer so I have to pay
double the price

Is above website sellers trustable? Is it common people resell watch
in above website?
Sorry again for asking help but it would be very appreciated
Thank you