Hi all, here is a link I found a while back to a site that sells a 15 gallon conical plastic tank which I think would be ideal for a conical fermenter. I plan on purchasing one when I have the time to retrofit it with all the connections. I believe you can purchase the tank connections which would be for the stainless version but a good scrounger should be able to figure it out on the cheap. It comes with a stand for $104 and $40 shipping. The 14.5 gal standard "fermenator" is $585 plus shipping at Austin Home Brew Supply. With the Tri-Clamp it's $809, so I think it could be fitted out for less than half of what a new stainless one costs. One of the uses is for Biodiesel, but I'm not 100% sure about it being "food grade" or not.
Here's the link: http://www.plastic-mart.com/class.php?item=2800