The first listing was $159.99 plus $2.83 shipping per item.
The current listing is $159.99 plus $22.21 shipping per item.
There seems to be no bulk discount for shipping :-(
Sorry about that I only noticed shipping costs after I posted.
I thought the shipping costs were bit excessive: in USA initial drive was like $22 but when I checked the additional drive was about $2.60 each for additional postage.
I don't know how other forum members feel, but these shifting sands on the deal is a bit of a turn off.
I can understand the seller is really busy at the moment, I'm happy to wait a few weeks and see what turns up.
4 drives @ $145 each = $580 order.
20 drives @$145 each = $2900 order.
Maybe seller should consider extra discount to make it worthwhile for someone to coordinate a bulk deal.