If you don't mind paying full retail, Call Dustin at simple Sku. They are back east but he's brilliant to deal with. An order of mine got lost in mail and he was all over it. Ended up GIVING me the bags because he was so service oriented. Top shelf service. They don't list the 1 liter oil online, but they do have it.
That being said, there is some lubriplate dealers around, but few and far between. There's a local guy that sells penn lube he may have it, I can check. Although oil is oil, in this application my opinion is to use a food grade oil