We often see this hard Brazilian wax cited as an ingredient in various lubes, and recommendations for using the wax seals from booze bottles, cheeses etc, as a source.
First, as in the title, the spelling is "carnAuba", not "carnuba", although the second (mis)spelling is now so common that some suppliers use both. Searching Ebay for "carnuba" got only 6 hits, but searching for "carnauba" got 66 hits. Ergo, if you search with the wrong spelling, you'll miss a lot of places and possibilities.
I found block or flake pure carnauba on Ebay at $8.00 per 1/2 pound, buy-it-now, and the stuff is also available in liquid and paste form. I'd be suspicious of the chemicals used to keep it liquid or in paste form, if using it for bullet lube.
So....the stuff is available, and we don't have to have a case of unsealed Maker's Mark bourbon in the closet just so's we can make some lube. I like whiskey as much as the next feller, but this would be devotion to casting "above and beyond the call of duty".