Gesswein has a large selection of the Grobet Swiss Pattern Files. They offer many configurations of each file. Not cheap but very good and long lasting as I have used. I agree with Steve Miller's comments on shapes, but I would add a small half round...
I have probably 200 scales in stock and most are stabilized. Some natural and some dyed. I bought most of mine from guys that do a lot of stabilizing for pen blanks and game call blanks. I have had good luck with all of my material and never really had any issues with it. Great to work with...
Check out this guy http://www.gstongs.com/ Super to deal with, he has a great pattern for knife tongs that really work well. He is in Taiwan but ships all over the world no problem Great service.