i once bought a disposable camera, ripped her open: saved the film, lenses & springs along with a perfectly good flash unit.Remove the battery- You must be careful as the capacitor will have a charge (about ~200V!) and I discharged it beforehand...be veeeerrry careful I wouldn't do this unless you have experience with electronics. The flash unit comes out as one piece, I made a plastic case for it using an watchbox and some modeling glue. for a $5 flash +a free roll of film it's worth it: if you'd like to the diy way it was more a proof-of-concept thing, but it still works after +6 months.