Just about any golf shop should have it. I picked some up at Dick's Sports as well as some more at that shop going out of business. You don't want to load that driver up too much but 2-4g can make a noticible difference in shot patterns.
Put it on the back of a driver. Esentially it will do pretty much the same thing the weights do on a driver like the R7. I'll post pics of the 3 I have tape on if you'd like.