Anyone know the best place to purchase tool holders. I need to purchase 6 tool holders with collets and covernuts. Thermwood offers them for our machine for $160.

Try this place http://tormach.com

also try here- http://www.cnczone.com/modules.php?name=Links&file=viewcategory&cid=31

I've bought from here before. Not for a Thermwood, though.

http://www.guhdo.com

Now I buy most of my tooling from here.
http://www.vortextool.com/standard/productGroups.cfm?catID=94