I have 9 spinning drives left.
$34 each shipped, $50 for 2. $200 shipped for all 9
(original info below)
The 500gb HDDs are 5400rpm SATA 6gb/s 2.5" drives. Mostly Western Digital Blue & Toshiba. They are basically new as they were pulled from new machines and replaced with SSDs right out of the box.
Shipping will be priority small flat rate box @$9 to be simple, unless the quantity needs better packaging.