Didn't see anyone post this yet, but newegg has a SAPPHIRE Active DisplayPort that doesn't cost an arm and a leg, i'm using one right now for my eyefinity setup and its actually really decent for the price.
http://www.newegg.com/Product/Product.aspx?Item=N82E16815310003&Tpk=sapphire displayport
http://www.newegg.com/Product/Product.aspx?Item=N82E16815310003&Tpk=sapphire displayport