Hello Jens,
I have only just seen your thread on sheet plastic, I am an avid scratch builder and get all my supplies from my local hobby shop,
TRANSPORT MODELS OF PRESTON LANCASHIRE ENGLAND, they have a web site and internet service, a sheet of 30 thou plasticard is approx 24 inches by 17 inches is 6 pounds and you can make a lot of bits with a big sheet like this, they also have smaller sheets clear and all other designs with rivet and panel ect. Check out the site they are very helpful I have been using the shop for years. As for
evergreen products they have shot in price and I only buy tubes and box sections when I really need them, there are other things out there you just have to keep looking. You will see from some of my post I use a LOT of plasticard and the shop gives excellent value for money.
regards Barrie ( the old guy ) my models are in the sci fi forum have a peek.