Do not even waste your time looking. I went to Spain several years ago and searched all over even Barcelona for a cool tack shop to no avail. They do not carry goods geared towards hunters or jumpers. Now--if you wanted to outfit an Andalusian for a parade you might have better luck.
When I was in Spain on a riding vaca our guide took us here
It has some tack, good variety of boots tall and short and chaps, and a lot of really nice other leather goods; bags, purses, accessories, and jewelry
I don't remember exactly where it is, I was staying on Seville.
I'm sure you will be able to find something near you, and its definitely worth looking, they do jump over there too, and it is fun to see all the fancy baroque tack.
Fyi, the Euro's in pretty deep right now, so it's probably not that great of an exchange rate. I know it's currently god awful in Cypress, and if their banking system collapses, then the Euro is definitely on its way out. Germany can't bail everyone out forever.