Not sure who uses infiniband but what a great price for 40Gbe switches.
MELLANOX VOLTAIRE GRID DIRECTOR 4036 1PS 40GBE INFINIBAND SWITCH 4669-HCP-IBM | eBay
MELLANOX VOLTAIRE GRID DIRECTOR 4036 1PS 40GBE INFINIBAND SWITCH 4669-HCP-IBM | eBay