Your bike shop might have it on hand, if not it's a relatively easy enough thing to order. When you go to the lbs ask how much it would be for them to top off your oil, if you're not comfortable working on your fork. It seems you're competent enough though. On my Revelation you pretty much just release the pressure in the positive and negative air chambers, loosen a couple bolts and junk, and you're in like flynn. But I have no idea how your fork is set up. A good reference book to have would be Zinn and the art of mountain bike maintenance. Mine has served me very well. Other than that, the only advice I can give you is to not connect the shock-pump to the bike while upside down, or you'll have a pump full of oil.