I got the $7 one from Lowes and it works fine. I might have to sharpen it though, it does slide off to the side sometimes but usually only if I'm too lazy to screw the carto down right......... I tend to open only one side of the punch to take out the carto and slide a new one in to punch. If it's not pretty much equally screwed in on both sides, I find that it tends to slide more. I am considering the carto punch from Phiniac though to see how that works.. It looks really easy, too.