I posted this quetion in October and here is what I was told:
As for Omaha...here are your choices:
O8 - 4/8 games at Orleans, Palace Station, 20/40 or 40/80 at Bellagio. 6/12 at Wynn once in awhile.
O High - 4/8 at Boulder Station, GVR (once in awhile) and Sunset Station. 5/10 full kill at Mirage

Do post when you are back and let us know what you find.