Check out the Belkin 6050 USB adaptor. Am not sure if it works in 9 but works well in X on my son's rev. D iMac wirelessly connecting to an AEBS and my new iMac and at $29. refurbished, it can not be beat. Has Mac software and is simple to set up. Take a look at the Belkin site to see if it will work for you.
Good luck......Rich