Parts Express doesn't carry these items (I emailed P.E. to check), so I don't believe this post goes against any rules.
I am going to order diaphragms for my AST 25120's and 30130's. If anyone needs these diaphragms, here is the pricing they gave me:
|AST 30130 replacement diaphragm||60|
|AST 25120 Replacement Diaphragm||75|
The shipping charge seems reasonable @ $59, and my wire transfer fee is about the same (both of those additional charges would be split up). Individual shipping I could use USPS P.M., which is extra.