Realistic dice site may be very difficult to search them due to the fact that most of the reputable dice casino sites don't offer realistic dice game. Just keep searching and you may stumble on one soon.
For me, dice game on many gambling site is almost the same.
Maybe the different is the interface on the game which can make someone stay for some time or have a good time to play dice game on that site.
It will better that we do not have to search for that such thing but we can search for the reputable dice gambling site because that can make us to prevent the scam.
I hope @OP can know what he wants by reading on the other members suggestion.