Just search for "binary" on the gambling board and you will find a lot. But I'm not sure which one is good. Maybe you want to try btc.sx ->
https://bitcointalk.org/index.php?topic=233434.0 that's the mother of all binary trading stuff here and quite trustworthy.
I will look into it, but it looks more like an exchange site. I just want similar to a sports betting site, place a wager or pickup someone else's. So much simpler imho than trading sites =)