A tubing cutter? Never heard of it, but I can only assume it cuts the tube without bending it out of shape... sounds like a grand idea. Where can I get one?
Warhammer39999 - I got mine at the hobby shop (a very "train-centric" one) but you should also be able to get one in the plumbing aisle of your local home improvement store. They're made for metal tubing, but since I wrote the above post I've used it on styrene tubing and it works great.