hello everyone. I am looking into ordering an insul flue. I have called nearly every chimney sweep in my area and no one has responded,and the one that did gave me an estimate and never came back to do the work. I have been researching the insul flue for a while now because I have to go through a combustible wall. In my searches I have called all wood stove shops in my area and searched the web, but could not find one under $300...until now. However the price seems to good to be true. Here is the site I found it on. It's the complete unit. Has anyone ever ordered from these people, and are they reputable? Also is BDM the only manufacturer of the insul flue, or could I be getting a knock off? Thanks everyone in advance! (broken link removed to http://www.lindemannchimneysupply.com/insul-flue-thimble-6-2-boxes.html?utm_source=google_shopping&gclid=CIP1p5_ng8kCFQeOaQodnIoEpQ)