Where are you seeing 8TB (assuming you meant TB and Tb) for $300?

At Amazon. Guess I needed to check it better. Also I shouldn't did it in a bar. sigh

Anyway, I have a spreadsheet with both the prices and $/Gb/Tb so I just copy the relevant part here and hope formatting would persist:

    $/Tb Item Interface Capacity Price, $
     $90 SSD 4Tb Samsung 870 QVO (MZ-77Q4T0BW) SATA3 4000 $359
     $96 SSD 2Tb Samsung 870 QVO (MZ-77Q2T0BW) SATA3 2000 $192
    $102 USB 1Tb SanDisk Ultra Dual Drive Go (SDDDC3-1T00-G46) USB 1000 $102
    $103 SSD Samsung PM1643a MZILT3T8HBLS-00007 3.84T (root) SAS 3840 $394
    $104 SSD 4Tb Samsung 870 EVO (MZ-77E4T0BW) SATA3 4000 $417
    $105 SSD 2Tb Transcend 225S (TS2TSSD225S) SATA3 2000 $210
    $106 SSD 4Tb Transcend 230S (TS4TSSD230S) SATA3 4000 $425
    $107 SDXC 2Tb MicroSD SanDisk Extreme (SDSQXAV-2T00-GN6MN) SDXC 2000 $215
    $109 SSD 2Tb Samsung 870 EVO (MZ-77E2T0BW) SATA3 2000 $217
    $111 SSD 2Tb Kingston KC600 Series (SKC600/2048G) SATA3 2000 $223
    $115 SSD 8Tb Samsung 870 QVO (MZ-77Q8T0BW) SATA3 8000 $923
    $128 SSD 7.68Tb Samsung PM9A3 (MZQL27T6HBLA-00A07) OEM U.2 7680 $985
    $129 SSD 1Tb Samsung 870 EVO (MZ-77E1T0BW) SATA3 1000 $129
    $134 SSD 3.2Tb Intel P4610 Series (SSDPE2KE032T801) U.2 3200 $430
    $140 SSD 1.6Tb Intel P4610 Series (SSDPE2KE016T801) U.2 1600 $224

So 8Tb QVO are $115/TB.

Might be useful to add an "endurance" column to this, as the enterprise drives will tend to have multiple times the endurance of the consumer ones.

The endurance ratings are definitely worth knowing about if you write heavily to things.