SAS is used in enterprise hardware. Consumer hardware won’t have SAS connections without an add-on card.

You’re better off getting a SATA drive.

Amazon sales and prime day and Black Friday are all totally bogus except for a few specific loss leader deals. Everything else is on sale based on marked up prices

I have some disk images that need to be bit perfect. I store them on a ZFS RAID AND I made PAR files for additional redundancy, and I keep two copies on two different computers.