Ditto.
I did a water feature, and went to a pond message board and asked for some scraps. Person sent it to me for the price of shipping... a nice 3 foot by 3 foot section.
I made one water feature out of it, and don't know if I will do it again. If I do do it again, I will do it outside on a hot day in the sun, as the liner becomes MUCH easier to work with. I worked on mine in the basement, and it was a PITA (very hard to control) and I'm still not happy with it (though it works). I tossed the scrap on my back deck, and when I got around to cleaning it up one hot saturday, the stuff in the sun was a maleable as saran wrap.
hth,
JOSH