Western Digital's 16TB enterprise helium drive, the direct competitor to the Seagate Exos line. CMR recording, 24/7 rated, 2.5 million hour MTBF. Performance is close enough to the Exos that price and SMART health should decide which you buy rather than brand preference.
Across 3 listings tracked in the last three days, the median total cost in USD including shipping is $330, and the lowest is $330. RackSniper flags a listing once it falls at or below 70 percent of the trailing 30 day median, which for this product means roughly $231 or less. Condition and configuration vary widely on used enterprise hardware, so treat the median as a reference point rather than a target.