Probably Brian Enos and certainly EBay. But there are many alternatives that are lower priced, like Imperial Sizing Wax and their Dry Neck Lube.
Using a wax is too time consuming hence the need for a sizing spray
. I like Dillon's case lube spray. Lay the cases out, give them a spray and let them dry for 10 - 15 minutes. No need to rotate and spray again, the stuff will spread itself around the case.