I have been purchasing my Oil of Spike Lavender, and my Canada Balsam from Art Treehouse, located in Madison WI.
The have very good materials, at very reasonable prices. Robert Maynord, who is the owner is a very pleasant person, and the products he offers are very good. With my next order, I plan to even order a palette pad, as well as some picture hanging wire. Their Water-Washed Walnut Oil and Water-Washed Linseed Oil are looking good to me, also. I may ask for a couple of those items when placing my next order.
This is the address of the Art Treehouse: https://www.arttreehouse.com/store/