can get some of these from work for your interest (not meaning to advertise, and I cannot gurantee the quality, but they're cheap..) price INC. GST, NOT INC SHIPPING, 1 YR WARRANTY
both no flash, both can be connected to pc as "webcam" via USB, both with built in 8MB memory (not upgradable)..
res: 640x480 can hold 26 640x480 or 107 320x240 pictures dimension 52.5x91x22mm $116
res: 320x240 can hold 80 352x288 or 320 176x144 pictures dimension 54.8x94x26.5mm $95