Smith’s is sold at Lowe’s and Ace hardware, here in California, but not all of them carry it. A lot of knife stores carry it.

Sells for about 5-6 bucks, one bottle lasts a long time. I put it in a 1oz empty make makeup sample squeeze bottle, that will release just one drop at a time. The bottle it comes in releases more of a stream and you don’t need that much. Wet the stone, add a drop at each end and one in the middle.