Reply to ultra compact usb controller (small jog wheels, a few buttons and a cross fader)

i usually have my audio2dj audio interface with me. frequently at ultimate frisbee tournaments i then end up DJing a bit. but DJing with the keyboard is a hassle and its just very error prone (just forgot to go into search mode and you end up fucking up everything if you rely on the keyboard to control your decks). also its just annoying to have to use the mouse to scroll through tracks. finally there is often not even a mixer with a cross fader.

so what i want is a simpler simple DJ controller that gives me 2 jog wheels a few buttons and a cross fader that is small and light enough that i don't mind throwing it in my backpack.

sort of a minified version of http://www.ionaudio.com/products/details/discover-dj
i found http://www.numark.com/product/dj2go but would wish for it to be even smaller.