Samsung 128GB, DDR4, 3200MHz, Single Stick (M393AAG40M32-CAE)
This single 128GB of DDR4 RAM from Crucial costs $4,000 | PC Gamer
A-Tech 128GB Module for HP Z8 G4 Workstation - DDR4 PC4-21300 2666Mhz ECC Load Reduced LRDIMM 8Rx4 - Server Specific Memory Ram (AT378314SRV-X1L3) at Amazon.com
Desktop Memory - G.SKILL International Enterprise Co., Ltd.
Found a 128mb ram stick while clearing out : r/mildlyinteresting
Kingston HyperX Fury 128GB 3000MHz DDR4 RAM CL16 DIMM Black Single Stick Desktop Memory With Low-Profile Heat Spreader - Walmart.com