Not $15/TB, but this is $9 cheaper than the lowest price ever, from good old pre-Chia times. The price will probably continue to go down further thanks to the mess in HDD market that Chia has created. The store promises price match within 7 days of purchase if you find a lower price.
Unlike shucked WD drives, this is a true enterprise drive that works at full speed (261MB/s) and has a 5 year warranty.
Use code SAVEALINCOLN
to get $5 off the 321.21 price. Works once per account but that won't be an obstacle for true slickdealers, I know 8)
No tax in California,
probably some other states, too