Last night, I read the following in Kiplinger's Personal Finance Magazine...
Stay one night at these hotels and park for free.
Park and Fly Rates around the Country
Atlanta HoJos $59
Boston HoJos $99
Chicago ORD Wyndham $79 (and don't forget the Platinum Triple upgrade deal)
Cleveland Radisson $89
Dallas DFW Holiday Inn $69
Detroit Doubletree $75
Fort Lauderdale Ramada $63
Vegas La Quinta Inn $62
LAX Holiday Inn $79
St. Louis Doubletree $69
Hope this helps