Big Fish Games has dozens of these types of games, both for playing online for free and to download a demo version for purchase after an hour of play.
I think I remember you once saying that you already play there, but in case I'm remembering incorrectly, here's a link to their hidden object category of games.
If you still play there and want to hook up, let me know and I'll PM you my user name there.
I've purchased a few of the games and still play them repeatedly to try and improve my completion times. I like the Hidden Expedition and Hidden Mystery Game ones the best. They're still enjoyable no matter how many times you play them. Some of the others ... not so much.