OWC 32GB (2 x 16GB) PC21300 DDR4 2666MHz SO-DIMMs Memory, Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs, (OWC2666DDR4S32P) at Amazon.com
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Dell Memory Upgrade - 32GB - 2Rx4 DDR4 RDIMM 2666MHz | Dell Hong Kong
CORSAIR VENGEANCE PRO 32GB (2PK x 16GB) 3600MHz DDR4 C18 DIMM Desktop Memory with RGB lighting CMW32GX4M2D3600C18 - Best Buy