If all else fails, try a local park, a lodge (maybe you know a member), a community center, or even somebody with a large home. Lots of time the people need publicity and a wedding would give them this.
You could even place a classified ad. If you tell them you are planning an event (leave out wedding may save $$). I have noticed every time you mention your event is a wedding, the price automatically goes way up (unfair), so if you omit wedding & just use Event you could save some money there, too.
I hope this helps a little bit. :)