regarding caliper rebuilding, you might want to check the yellow pages and see if you can find a rebuilder in the area. I'm in a medium-sized city, and we have a shop which can rebuild just about any sort of hydraulic cylinder found on a car or truck. I've brought them several sets of Alfa calipers, and paid ~$40/per. Media blasted, new hardware, seals, etc., and they work great.
And, you can even check some other sources you might not expect:
While we find your parts, please enter your ZIP Code at PartsAmerica.com
Just an example, and you may have to bounce around checking different years for fronts/rears. as their listings aren't always complete. These ATE parts were used on quite a few Euro cars (Volvo, Porsche, VW, etc.), so they're really not hard to find with a little research.