The Airtech 401C are very reasonable in price. On their webshop 21.5 dollar, but through a distributor they might even be cheaper.
The self-cutting, screw on type is for instance the Airtech 425. You can check on the www.airtechonline.com website in their catalogue, but you need a login. If you are lazy, just check their European catalogue, at www.airtech.lu (click “products” which already is outlined)
Thanks, I should probably go ahead and get a login ID with them. I figure you are right, 21.50 is pretty cheap for the Airtech pieces, but those Torr pieces looks to be nice machined pieces as opposed to the cast Airtech ones and they are $3 cheaper. After looking at the Euro catalogue, it appears I have used the 406TF units they offer… I bet they pull a pretty good price, though.