On Kickerstarter, there is an interesting kickerstarter for a new wireless/wired page turning pedal, the PageFlip Firefly. Looks like a great way to get one for cheap (probably like $20 off). They don’t ship until Feb 2014 though.
I don’t have any experience with using these on an iPad, but I have been using a “classic” X-Keys pedal for about 6 years for my dual monitor teaching setup. It works great.