Most sites offer Omaha H/L, the problem is I never see anyone playing it. When I took over a group I started a 5 day event with 5 different games, no hold-em. Worked out well and Omaha H/l as well as Stud H/l were always played each week.
Perhaps trying to start a tournament in your club and see if there is any interest.
ACR has 0.1 buy-in Omaha h/l tournament everyday, $100 GTD.
About 700~800 players, late reg for 2 hours.