Check out this company in Southeast, TEXAS: http://www.texasdrone.com/carnauba-wax.htm. Says it's "offered in different colors, grades and forms. The most widely used are the prime # 1 yellow grade which is a very pale yellow wax usually available in flake, lump, or powdered form."
Here's another source for a 5 lb box for $38.50: http://www.ppe.com/10cat/0606.pdf. Depending on how much and how often you're going to use it, it might be more economical this way.
A simple GOOGLE search for "powdered carnauba wax" turned up these sources and others. Art
I just got a couple of bottles of this stuff from John and can recommend him to others. It's as fine as talcum powder and came when he said it would. Can't ask for much more then that. Thanks John....