Not as good a price as those RE SAS drives from a short while ago, but I think (?) this is a good deal for Hitachi. 8 available.
Hitachi HUS724040ALS640 7200RPM SAS 3 5 034 4TB Hard Drive 0B26885 64MB Tested | eBay
Hitachi HUS724040ALS640 7200RPM SAS 3 5 034 4TB Hard Drive 0B26885 64MB Tested | eBay