We did it! The drives have been ordered and have a ship date of June 28th. This particular model, the largest Seagate Exos drive, is sold out everywhere. I ended up having to place an order through one of my employer's suppliers to get them for this price and with any kind of ETA. Amazon, B&H Photo and CDW all just have the drive listed as backordered with no ETA. Third-party sellers on Amazon have raised the price on the inventory they have left to $769 per drive.
I just wanted to thank everyone for all the donations. I received a total of $2,736.02 in donations so my out of pocket for the drives was only $19.45.
I'm going to work on fixing the system so that new content gets added while we wait for the new drives. Currently, the docker containers are very upset that the NAS is gone.