Interesting expander. Looks like it is a pull out of a thinkserver rd640.
New Lenovo 03x3834 ThinkServer 24 Port SAS Expander Card w Cables | eBay
Looks like someone is selling a knockoff version of it as well for $125
New 6Gbps SAS expender Card 16 Port SAS PCI E Expander Board for 9240 8i 9261 8i | eBay
New Lenovo 03x3834 ThinkServer 24 Port SAS Expander Card w Cables | eBay
Looks like someone is selling a knockoff version of it as well for $125
New 6Gbps SAS expender Card 16 Port SAS PCI E Expander Board for 9240 8i 9261 8i | eBay