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Oceanside Store on Amazon has the 18TB WD Ultrastar DC HC550 7200 RPM on sale for $ 315
https://www.amazon.com/HC550-18TB…B08NWF1X
If you want a solid 18TB drive filled with helium and provide better performance than shucking many of the WD external drive deals from BestBuy, this is a decent drive model. I purchased 4x of these drives from Oceanside store on Amazon for $ 315 in the beginning of May and they the full 5 year US warranty after registering the drives.