16TB Seagate Exos X16/X18 $159.88 Ironwolf $169.99, 16TB Western Digital $164.99 3.5″ 7200RPM SATA Internal Hard Drives (Mfr. Recertified) $159.99

ServerPartDeals has
Seagate
16TB Seagate Exos X16 3.5" 7200RPM SATA Internal Hard Disk Drive (Manufacturer Recertified, ST16000NM001G)
$159.99.
16TB Seagate Exos X18 3.5" 7200RPM SATA .Internal Hard Disk Drive (Manufacturer Recertified, ST16000NM000J)
$159.99.
16TB Seagate IronWolf Pro 3.5" 7200RPM SATA .Internal Hard Disk Drive (Manufacturer Recertified, )ST16000NE000)
$169.99
16TB Western Digital Ultrastar DC HC550 3.5" 7200RPM SATA .Internal Hard Disk Drive (Manufacturer Recertified)
$164.99
Shipping is free.
Seagate
Seagate 16TB X16
https://serverpartdeals.com/colle…tified-hdd
Seagate 16TB X18
https://serverpartdeals.com/colle…hard-drive
16TB Seagate Ironwolf
https://serverpartdeals.com/collections/manufacturer-recertified-drives/products/seagate-ironwolf-pro-st16000ne000-16tb-7-2k-rpm-sata-6gb-s-512e-3-5-recertified-hard-drive?
Western Digital
Western Digital Ultrastar DC HC550 WUH721816ALE6L4 0F38462
16TB 7.2K RPM SATA 6Gb/s 512e 512MB 3.5" SE Manufacturer Recertified HDD
https://serverpartdeals.com/colle…tified-hdd
Western Digital Ultrastar DC HC550 WUH721816ALE604 0F38456 16TB 7.2K RPM SATA 6Gb/s 512e Power Disable 3.5in Recertified Hard Drive
https://serverpartdeals.com/colle…hard-drive
Western Digital Ultrastar DC HC550 WUH721816ALE6L4 0F38466 16TB 7.2K RPM SATA 6Gb/s 512e 3.5in Recertified Hard Drive
https://serverpartdeals.com/colle…hard-drive