fabfound, the horn driver is a common type so finding a diaphram shouln't be too difficult. As Skilz suggested check out those local suppliers, you don't necessarily have to get them from AA.
I recently blew the diaphrams on my APXs, I ended up getting replacements from the AA re-seller -Lightsounds here in Australia. They cost me $98AU each. Assuming you are from the States it will obviously cost you much less.
ROQ out
PS. Replacing the diaphrams is a piece-of-cake, if you wanna save a few bucks have a go at doing it yourself, you'll be surprised how easy it is. Good luck.
I can tell you how I fried my diaphrams, it was a freak mishap by some dopey bimbo pointing a microphone right into the APX that was setup as a stage monitor.
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