My pick is the Ebay Digital camera of choice, Camedia E-10. The professional SLR Olympus Camedia E-10 that outperforms any other $100 camera new or used. It has a high quality lens that I bought. I don't know why I could have got mine for $100 and works fine. It 4 MP lens looks like mainstream 12 MP SLR cameras like the 12.2 MP DIGIC III Canon Rebel Xsi.
It has an all aluminum body. Mine came with Olympus CR-V3 lithium batteries.