Ive also been seeing some various Intrigue parts up on Ebay for pretty darn cheap, there was an AC compressor for the 3.5 on there just the other day for a little over 100 bucks, it was used, but hey, if it works thats a steal.
There are also places that are selling entire engines, which may mean they have the car somewhere else, so it wouldnt hurt to ask the seller if they have parts like the condenser and whatnot you need to put up for sale.
If you have a junkyard near you all these parts should be easy to find, but I know thats not always an option.
It also wouldnt surprise me if the other W-body cars use the same AC condenser as the Intrigue, but confirming that would require a bit of searching, perhaps a project for me later