AlesisMusic.com - The Unofficial Alesis Support Forum

Apparently, MPCStuff still has 128MB memory modules for 55.00 US. These are listed as for the Akai MPC5000, but are identical to the ones in the fusion. I know, this is where I got at least one set for one of my Fusions, they work perfectly.

https://www.mpcstuff.com/mpc-5000-exm-e ... nsion-ram/