If you are going anywhere near Gibraltar you COULD try there. It's supposed to be duty free but in my experience it's not that cheap and you have to be careful. Shop around (there are several shops in the Main Street) but especially- know what you want, what should be included and what you would pay here! When I was looking for a Nikon 18-200VR on shop tried to sell me a Tamron 18-200. I bought my first DSLR from there and was ripped off a little.
Ian