> comparison shopping is so hard

Yes, but it's much worse than it needs to be. When searching for hard disks on Amazon, if you search for "hard disk 8 tb" for example, Amazon will suggest the following criteria on the left side of the page:

Hard Disk Size

4 TB & Above

3 TB

2 TB

1 TB

501 to 999 GB

321 to 500 GB

121 to 320 GB

Up to 80 GB

Really? What is the point of this? How can it not do better?