Of the primary Spanish makers (AyA, Arietta, Garbi, Grulla, Arizzaballaga, and Ugartechea), the most expensive are Arizzabalaga (there have been several companies of the name Arizzabalaga. The current one is Pedro. He has either died or retired, and thee status of the company us unsure) at $8,000 - 12,000 depending on wood, etc.
Garbi makes a fine low cost gun that is all handmade (no power tools), except for an electrical engraver. Depending on the importer, I've seen them for under $2,000. Arietta guns are in the $5,000 - 7,000 range.
Ugartechea has made guns that run the gamut from "cheap Spanish boxlocks" to guns that can truly be called "best." I was once quoted a price on a matched set of Ugartechea guns, made to order, of $9,000.
Prices vary widely on the Spanish guns. A method recommended by Terry Weigand is to take a trip to Eibar, and purchase the gun direct. You should be able to save enough to pay for the trip, and you get to pick your own wood, and have the gun truly fitted to you.
HTH