and ebay is dirty with 10G SFP+ mellanox cards, many under $20. 24 port 10G SFP+ switches can be found for $300, and they all work fine with the cheap SFP+ modu

and ebay is dirty with 10G SFP+ mellanox cards, many under $20. 24 port 10G SFP+ switches can be found for $300, and they all work fine with the cheap SFP+ modules from fs.com