Depends on how much you want to buy. Loads of people o. EBay and Amazon sell small cups of the stuff that are more than enough for a barrel job or 2. The cheapest place I found for a full tube was:
https://m.skygeek.com/aeroshell-33ms.html
Which is now Aeroshell 64. If you want to look around, Google MIL-G-21164D
Bookmarks