Don't know if anyone else knows this, first time on these boards, but decided to post it here. When a friend and I were messing around, I think we stumbled onto a duplication glitch. Anyways, one of us had the dispenser window open, and the other destroyed it. The dispenser screen stayed. Then, we put the dispenser back, took the item out, and it would look like a few stacks of the item fell on the ground (we haven't been to pick these up yet.) But in our inventory, of the guy who was on the dispenser screen, was a stack of sixty four of the item (It was redstone) It's worked for every other item we've tried.
So... sorry if it's already been said, but he's an easy way to get items, I guess? --- Always look on the bright side of life. *whistles*