There is one guy who used to work with these quite a bit. I've exchanged e-mails with him but have lost touch. I have seen these listed on the colubrid classified.
The problem is that you can type every imaginable word into the search engine and still miss a specimen you are looking for. Given the number of posts on that market going through each add is difficult.
Hopefully anyone working with Trimorphodon will take the time to type that into their ad.
I was supposed to send you a dichotomous key for Madagascarophis, wasn't I?