Dean Hoffman wrote:
....
We used the old five gallon oil cans out on the farm. ...

Was going to say/suggest same thing. Fortunately, still have a sizable
collection that will outlast me...

Where to look would be highly dependent on where OP is located, I'd
think. Major city/urban area would be tougher I'd think than rural
given few city-folk deal in bulk oil products.

--