Does anyone know if you can purchase off the shelf memory for these or the Falcon series machines?

Are you kidding? CAll memoryexperts (Who i think advertises on this site) for Falcon memory at 10% of the KMA cost.

Don't know about voyager, but we ONLY buy aftermarket mem for all faclon products

Be careful with Falcon III memory. We got some that was supposidly for the falcon III, but out of 8 sticks, only 5 of them worked properly without giving us problems. Additionally, Kyocera only supports OEM OR Techworks memory.