Could you narrow it down a bit as to what region you'll be in? Spain has a lot of "items" so it would be helpful. Also, any restrictions on packing or shipping?
Here are a few of my favorites:
Lace in Camariñas, Galicia
Hand woven blankets, throws, etc. Morella, Castellón
Jarapas in Níjar, Almería
Ceramics – Talavera de la Reina (all over really)
Here's a website for Andalucía: http://www.andalucia.com/art/home.htm