If you don't have a car and live in the city, I would take a bus tour to the casino. They're mostly free and run pretty regularly. See
http://www.resortseastchicago.com/transportation.shtml
No Pot Limit Omaha. Just a 5/10 Omaha Hi/lo game. Rake is $5 plus $1 for the bad beat on all 5/10 limit games or below.