Congrats on your new machine. Shoot an email to
[email protected] and ask for C3/4 ER20 ATC tool holders. IGS Tool is the Chinese manufacture of the TTS clones. They also now offer setscrew ATC holders in addition to ER holders. The ATC versions are ~$5 more each than the non-ATC. I've bought a couple dozen holders from then over the last few years. DHL shipping from China is a bit pricey, but you'll still save a measurable amount rather than buying from Tormach which most likely come from the same or very similar Chinese manufacturer.
-Mike