Thanks Jude, I bought a cheap Chinese knock-off of a Dust Deputy. I think it cost me about $25 AUD at my front door from Banggood.com.
With my shop vac it works a treat and I haven’t yet had to replace a bag in the vac although having said that it doesn’t work all day or even every day!
I originally wanted to purchase one of these, but they are out of production at the present and have been for a while. Supposed to be very good, effective and designed by Bill Pentz, a man who knows what he is about.
http://www.clearvuecyclones.com/cv06-mini/72-cv06-mini-body-only.html
Bill Pentz’s pages on dust control are well worth reading.
https://billpentz.blogspot.com.au/2011/07/dust-collection-basics-blog.html
http://billpentz.com//woodworking/cyclone/index.cfm#index.cfm