I ordered it from a company called Shafco. You'll have to order a case, which is about 75 bucks.
The good thing is, you can mix and match on thier products.
Weathershed, is "cosmoline" in a can. Which is what I used on my LCA's
Rust Veto, is a preservitive that dries (similar to MP50. Like a short term mold preservitive.
Cosmoline, is actually a penetrating oil.
Its a bit confusing, but if you go to their website, it explains it all. Check out the picture on this thread of the cans I have.
You could buy a can off ebay for about $10 with shipping. The Rust-Veto goes a long way.