Help!! Midway Airport Offsite Parking

[atigeg]

We used Avistar offsite parking near O'Hare Thanksgiving weekend and LOVED it. Now I am desperately seeking offsite parking for Midway for our next two trips. I found Avistar through airportparkinglots.com (and got an awesome rate), but they have no listings for Midway, and neither does longtermparking.com. Any suggestions?!?! Anyone know of rental car companies around Midway that might offer parking? One of our trips is Easter weekend, and I don't want to take the risk that Midway's ecomony lots will be full (this happened to my boss on a holiday weekend). No time to waste nowadays!
Barb
Visit the Platinum Castaway Club at: www.castawayclub.com