Look in the Yellow Pages for something like "Gasoline & Oil Marketers & Distrs". These are bulk oil & gas outlets that usually carry racing gas, greases, oils, kero and sometimes Jet-A. My local dealer, Goodspeed's, sells K-1 out of the drum into my jugs for $3.97/gal + tax. Price has been going up steadily for the last year.

Sometimes there are Yellow Page entries under Kerosene