I've also heard that the Titan had been available from Agristarts but that's no longer the case. I believe Botanique is currently the only one offering (their) plant. This could have been a case of Botanique having an arrangement with the lab - where Agristarts could also sell the plants for X amount of time and now that the window has closed the plant has reverted back to Botanique.

I think there are a few different arrangements one can make with various labs as to who offers the plant via wholesale, length of time plant will be offered, etc. One could also have a plant cultured and simply buy the minimum amount required. Hmm, I do think 1000 Schnell's Ghosts would look pretty impressive in the back yard