Paddy, wood is very expensive in Spain. If you are highly skilled at DIY it may be OK, but if you're not you may spend more than you think on a structure that may not be a good investment. I've just had a gazebo built by a specialist professional as I needed a larger shaded area in the garden.
But it looks better than I could ever do and was built from treated timber so it should last a few years and I reckon the cost is more that offset by the increase in value of the property (something like minus 70% of purchase price to an improved position of only minus 69% of the purchase price!).
The firm I used cover the San Javier area - http://www.woodworksdirect.com but there are others. I know it's not what you asked for but you might want to consider it as an alternative. Having said that, I believe that the guy who runs the firm, Simon, may sell you just the wood in a pack format, so you can do the erection yourself if you want to reduce the cost.