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Crucial 8GB Single DDR4 2666 MT/s (PC4-21300) SR X8 SODIMM 260-Pin Memory - CT8G4SFS8266 at Amazon.com
Crucial 64GB (2 x 32GB) PC4-21300 (DDR4-2666) Memory (CT2K32G4SFD8266) for sale online | eBay