It's kind of crazy that the price for hard drives hasn't really changed for quite a few years. Back in 2013, I bought 4x3TB WD RED disks for my NAS for £114.99 each. One of the disks just failed (wow 7 years!) and I was looking to just get a similar 3TB WD RED drive as a replacement. It's £92.42 on Amazon. Only a £22.57 drop in 7 years. I know hard drives would have improved since then, but still would expect the price to have dropped more significantly by now.