B&H is listing this drive for $449.99 with a coupon for $110.00 that gets applied to your shopping cart at check-out, for a final cost of $339.99
This translates to $18.89 per TB, which is the lowest price available for any 18 TB drives that I could find. It is also the lowest price I have seen for this model drive in months.
There is a limit of 5 units that you can add to your cart. The $110 coupon will get applied to each one.
If you want more than 5, I suspect that all that you would have to do is place multiple orders.
It appears that it comes with a 1 year warranty, which does not speak well for Seagate’s faith in this drive’s endurance for going the long haul.