Try Matthew Lovell at Telescopes and Astronomy (South Australia). He's always helpful and prices are pretty good.
http://www.telescopes-astronomy.com.au/
I bought an aluminium T Thread adapter for a Philips webcam from him recently. I screwed it onto a camera adapter that I bought secondhand with my scope.
EP projection was a little tricky to set up because the adapter shifts the EP away from the normal focal point. I'm using the standard Skywatcher 10mm Plossl with an SPC900NC and getting a similar effect to a Barlow. With a 20mm EP I get about the same magnification as at prime focus.
Kind regards,
Peter