I thought he was on TMG (I know not really a market) but didn't see him there. I also thought he was on SR2 but didn't see him there either. I only looked at SR2 out of curiosity and wouldn't use the market if that's the only place he worked from. I've wanted to try Tessellated for a long time but it's not gonna happen as long as they are strictly on SR2.
You can talk to him as well as order on the TMG forums.
http://bm26rwk32m7u7rec.onion/