Just got counter-offered $285 each for 2x 12 TB Dell/Toshiba units here:
Dell 753F0 12TB Toshiba MG07ACA12TEY 3.5"SATA 6Gb/s 7.2K Hard Drive | eBay
Dell 753F0 12TB Toshiba MG07ACA12TEY 3.5"SATA 6Gb/s 7.2K Hard Drive | eBay