Even without caddies, I think this is a decent deal. The 45 bay units always came with at least the SAS2 backplane and this one seems to be the dual expander version. This has been up for over a month, so I'm guessing they will take a lower offer too.
Supermicro 847E26-RJBOD 4U Barebones Chassis w 2 1400W Power Supplies | eBay
Supermicro 847E26-RJBOD 4U Barebones Chassis w 2 1400W Power Supplies | eBay