It is available for $1.49 from the Cydia Store. It is cheaper than 3G Unrestrictor and My3G, but again, it doesn’t do as much. If you only need FaceTime to work on 3G, then FaceBreak is your best bet. If however you need a mod to allow other apps to run on 3G, then you’d be better off going with My3G.
Have you tried FaceBreak? How do you like it?