Sun/Oracle branded Mellanox dual port VPI 40Gb cards @ $15/ea, these cross-flash to standard Mellanox firmware easily. I've purchased 4 from this vendor over the last few months for ~$20/ea. You may try to haggle down to $10/board, though $15 shipped is a ridiculously good price already
Sun 7046442 Dual Port 40GB/SEC QDR HBA | eBay
Seller is accepting offers of $13/ea for multiple cards.
You'll want QSFP <> SFP+ adapters to connect these to your 10GbE equipment:
Mellanox 655902-001 655874-B21 HP QSFP/SFP ADAPTER 656541864054 | eBay
Sun 7046442 Dual Port 40GB/SEC QDR HBA | eBay
Seller is accepting offers of $13/ea for multiple cards.
You'll want QSFP <> SFP+ adapters to connect these to your 10GbE equipment:
Mellanox 655902-001 655874-B21 HP QSFP/SFP ADAPTER 656541864054 | eBay
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