you can get 'useable' for sub 100 just about.
iwoot.com do a few , but the one i'd go for would be
this.
Sure, it isnt the best camera in the world, but seems to me a decent spec for the price.
The zoom is digital rather than optical, and its only really 3 megapixel, but it also has a flash, and an lcd screen.
3megapixel is more than enough for decent shots
(i have one thats 0.75 or so. the pics are useable, but not great. something 4 times greater should be verging on decent picture)
IWOOT.com isnt the cheapest place in the world, so if you were shopping around you could probably get it cheaper