Check your local farm supply shops, such as Mills Fleet Farm. I found the cartridge oil filters on their shelves for $3.50 each, which is cheaper than JC Whitney, after you factor in S/H fees. It pays to shop around! I have discovered that many parts I had mail ordered, were available locally, for the same money, or less, especially after factoring in S/H fees. Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII