Their Tri-Clamp fittings are quite expensive. http://www.csidesigns.com
is much cheaper, but they don't list their prices online. You have to email them with a parts list, they reply with a quote & quote number. You can call them, give them the quote number and place the order by phone. That's where I buy most all of my Tri-Clamp fittings. It might sound like a pain in the ass, but it's worth it especially if you need quite a few for a project. The savings is unbelievable!
I buy 3" ferrules for about $4.69 where Bubba's sells them for $9.91 which is twice the price.