seems like a good deal from a reputable seller. i'm personally not a fan of Seagate HDDs, but someone might appreciate this:
Seagate Enterprise 3.5" HDD v4 6TB 7200RPM ST6000NM0034 SAS Hard Drive 763649049358 | eBay
Seagate Enterprise 3.5" HDD v4 6TB 7200RPM ST6000NM0034 SAS Hard Drive 763649049358 | eBay