I'm trying to build a low cost NAS for my paltry needs, but the price per _drive_ doesn't seem to be moving. Every time a larger size is introduced, I scoff at the price for something I don't need, but the price of a 4TB doesn't go anywhere. I bought four drives on eBay, they were 80% of retail price, and all four were dead. It's pretty frustrating but I don't want to spend so much money that I don't have.