Samsung 32GB DDR4 2666MHz RAM Memory Module for Laptop Computers (260 Pin SODIMM, 1.2V) M471A4G43MB1 at Amazon.com
Kingston ValueRAM 32GB (1 x 32GB) DDR4 2400 RAM (Server Memory) ECC Reg Micron A DIMM (288-Pin) KVR24R17D4/32MA - Newegg.com
32GB single stick RAM for Blades. Same manufacturer and clock speed (3200mhz) as the stock RB RAM. Only this RAM doesn't require XMP to achieve 3200 mhz. CL22. 2x for 64GB. :
ZADAK SHIELD Double Capacity DDR4 32GB Single Stick Memory Announced - ThePCEnthusiast
HyperX Fury Black 32GB 3466MHz DDR4 CL17 DIMM Single Stick HX434C17FB3/32 | eBay