A link? No, I simply clean out the tubes and re-use them.

By the way, to clean these things out well, first make sure all the toothpaste is squeezed out. Second, blow in the opening to re-inflate the tube. Then, fill 3/4ths with really hot water, add a drop or to of dish detergent, and let stand overnight, shaking once in a awhile. Rinse a few times and they clean right up.

I also cut the end off a tube to see if they would behave like "food tubes" and clips. YES, they do! The tricky part is the clip, which I'm working on, but a drop of contact cement on the fold seems to do the trick, and you can pry it open to reuse.