TigerDirect offers the Ultra USB 2.0 6-Port PCI Adapter Card , model no. ULT40325, for $19.99. This $15 mail-in rebate drops it to $4.99. With around $4 for shipping, that's $15 off and the lowest total price we could find. It features a transfer rate of up to 480MB/s. Rebate expires January 28.