For years I have just been buying used or refurbished hard drives. Only those verified to have no bad sectors. And I've had no more failures than I used to get from buying new. The prices are a lot higher than they used to be but I believe they are still cheaper than buying new. Ebay tends to have the best prices in my experience, but you can find them on amazon too. I get most of mine from MDD or goHardDrive and have used their warranty service without issue before.
If you go this route, you have to be careful to note the difference between "SAS" and "SATA" hard drives. SAS drives are often cheaper than SATA on the used market because they require a SAS controller and cables. It can be worth the added expense if the deal is good enough on the drives (particularly when buying many drives). As a bonus, the common LSI SAS controllers and cables are backwards-compatible with SATA HDDs so you can run a mix and not be limited to only SAS.
If you go this route, you have to be careful to note the difference between "SAS" and "SATA" hard drives. SAS drives are often cheaper than SATA on the used market because they require a SAS controller and cables. It can be worth the added expense if the deal is good enough on the drives (particularly when buying many drives). As a bonus, the common LSI SAS controllers and cables are backwards-compatible with SATA HDDs so you can run a mix and not be limited to only SAS.
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