Newegg has 8GB (1x8GB) Crucial DDR4 2666 PC4 21300 Desktop Memory (CT8G4DFRA266) on sale for $22.99. Shipping is free.
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Alternatively, Amazon also has 8GB (1x8GB) Crucial DDR4 2666 PC4 21300 Desktop Memory (CT8G4DFRA266) on sale for $22.99. Shipping is free with Prime or if you spend $25 or more.
Product FeaturesTiming: 19-19-19CAS Latency: 19Voltage: 12VType: 288-Pin DDR4 SDRAMSpeeds up to 2666 MT/sIncreased bandwidth by up to 32% w/ reduce power consumption by up to 40%