pitch bender for cheap casio?

[heartofglass]

This is probably a stupid question, but on my old M-audio midi keyboard (which is now broken), there was a sustain wheel and a pitch-bend wheel built into the keyboard. I now have an equally crappy $100 casio keyboard (don't have the model number in front of me, I think it's one of the ctk models), and I'm looking for something similar I can hook up to it. Preferably something with knobs I can turn, or something similar to the M-audio pitch wheel, rather than a pedal that I push with my foot. Also, preferably a combination sustain and pitch pedal... A better keyboard is a long way into the future for me (saving up for something I'm going to love, rather than going just a step up), so I'm trying to make the most of what I have, for now. I need to use this in live shows, unfortunately.