Since gohd is $244/ SATA drive now WD RE $195/ ea qty 13 available. I'm not sure I like refurbished though but might have a longer warranty than the gohd ones.
Western Digital re WD4001FYYG 4000GB 4TB 7 2K 3 5 SAS Hard Drive | eBay
or: Western Digital re WD4001FYYG 4TB 7200 RPM 32MB Cache SAS 6GB s 3 5 No Labe | eBay if you are feeling adventurous.
Western Digital re WD4001FYYG 4000GB 4TB 7 2K 3 5 SAS Hard Drive | eBay
or: Western Digital re WD4001FYYG 4TB 7200 RPM 32MB Cache SAS 6GB s 3 5 No Labe | eBay if you are feeling adventurous.