APX-100 is 2.62 Euro per 135 roll in 100 roll quantity. In the US, you really need to order a quantity for the shipping cost to make sense.

I have 200+ rolls in my freezer and it still seems to be available from http://www.macodirect.de

It doesn't really have any direct analogue, but when it runs out either FP4+ or Acros will become the replacement for me.