For Canadian's I think this is the best store to buy Knipex from is Atlas Machinery. They have a website but I don't have enough posts to be allowed to post a link it seems.
Amazon is good also. I find making a list of all the stuff you want and keeping it in your cart is a good way to track...
Saw a lad post a photo of a custom run of green westling socket trays he had done. Well folks they are finally here!!
http://westlingmachine.com/ToolHolders.html
I'm glad I waited all this time before ordering a set of these! :D