The current 12TB deal is $15.83/TB. $1.83/TB isn't so much to me that I would consider it 'significant'.The 14TBs were $14.25/TB, considering the higher the density of drive, the more expensive (ESPECIALLY at the top end).
The 14TB drives were a significantly smarter buy.
Mostly i got some promo in 2019not sure if it is just me. I never get those eBay Bucks promotion.
I have called eBay multiple times.