PokerStars and FullTilt have 5 card draw games....
Since this game is no very popular among online
poker players I think that You will probably only
find somewhat decent traffic at 5 card draw games
at these sites...
There are some smaller sites too like TigerGaming
and I think kthat Mansion Poker also has 5 Card Draw...
But since on those sites there not even many Holdem players
You will not find much action at their draw poker tables...
You can play stud and stud hi/lo on ACR, it's under the Omaha tab.