http://doughtyent.com/Got contact info you care to share? We can always use a source for quality products at a reasonable price.
I can tell you this, it takes me about 2 hours start to finish to make a push thru sizer from scratch. In time I hope to get this closer to an hour but even then I don't see how a guy can makes these for profit. Well, I suppose if your time is reasonably cheap?