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TigerDirect offers the EVGA SuperSpeed 2-Port USB 3.0 PCI Express Adapter, model no. 100-U3-EU30-TR, for $19.99. This $20 mail-in rebate cuts it to $0. With $1.99 for shipping, that's tied with our Thanksgiving Day mention (since expired) as the cheapest USB 3.0 card we've ever seen. (It's a current low by $22.) This adapter adds two USB 3.0 ports to your computer and supports data rates up to 5Gb/s. Rebate expires December 31.