well, i created one my self and put it into an "altoids" box, if you don't know, altoids is "the curiously strong..." breath mint. i put a radio shack switch on the side, and two prongs coming out the front. all you do is clip off the capacitor, remove the flash button from the board, and solder the curcuit closed. solder the two "fins" sticking out the side, and hook up the battery to the appropriate place. have the output, (the shocker leads) coming from where the capacitor was. if you want, you can keep the capacitor where it was, and solder 1 wire to each prong and when you flip the switch, it will charge the capacitor, (takes about 3 seconds) and they touch your little sister with the prongs. i have no digital camera with which to show you the unit, but it works quite nicely. different disposable cameras work differently, so the process really depends. the best way is really to figure it out yourself (that is the way i did it) if you go to walgreens, target, wal-mart, or some place of the sort, and say you need the cameras for school experiment, or your sons school experiment, they will probably give you a couple, if not, try elsewhere.
*disclamer* i cannot be held responsible to any damage of property, persons, or leds. and i do not personally use this device for devious or criminal intent.
disclamer added just in case of who knows what...