You can buy it in cans at many Ace Hardware stores or in bulk at industrial supply houses.
I bought it from him back in the early '90's and then figured out what the stuff was. I then bought it locally a few times but eventually switched to real Waxoyl - couldn't take the smell of the LPS3 after a while (too sicky-sweet). It does work extremely well, however (IMO) and creeps everywhere you put it.