I've had mine for quite a while, and can't remember where I got it. I do know that the AC Moore store in our area carries them. But be careful if you do get one and put it in your cutter.....when you place a Quickutz on the plate, place only 1 of the clear shims on top of it. Even then, you not need to press the handle all the way down.
If you can't find a convertor in your area, I'll be glad to get you one and ship it; in fact, I'm going by there tomorrow.
Paige