I have a few used barrels that only ever had food grade oils in them that would be great as a burn barrel, they are too dirty (in my opinion) to be used for any other cleaner type project but the fact that they held food grade oils make them perfect as a burn type barrel. They are a little greasy on the lid and mouth of the barrel but I am offering them up for free because I want the space.
If you are interested please mail me through here and put "Burn Barrel" in the subject line, thank you and have a great day!