fiercercsolutions also stocks them. Had a nice sale going on too.
I bought a bunch I think last year as they had a sale where they were willing to match cost to cost with AE oils, so a 2 oz bottle or whatever the size was came in at $2.50, so they did the 2oz units at 2.50 and the 5oz ones at 5.00 . I should have picked up the diff fluids too. Not liking AEs twist caps as they keep breaking.