v-Color DDR4 128GB (2 x 64GB) Hynix IC 2933MHz(PC3-23400) R-DIMM for Apple Mac Pro 2019 ECC Registered DIMM Dual Rank 2Rx4 1.2V CL21 (VHA21ASDRAG4T-CG29RD) at Amazon.com
128GB (2x64GB) DDR4 ECC Memory Kit - Apple
Lot of 4 SAMSUNG 32GB(128GB) 4DRX4 PC4-2133P-LD0-10-MB1 DDR4 1.2V MEMORY DIMM | eBay
R0X02A HPE Server Memory
IBM 00VK198 - 128 GB, 1600 MHz DDR3 DIMM CCIN 31EB by IBM