There are a number of great organizations whose membership is probably worth a small investment if you're thinking about a seven figure or greater exit.

The best, in my opinion, is BEI, which is an association of advisors HEAVILY focused on exit strategies for mid-size companies. I'll be attending their conference myself in August.

Links to other organizations to look at joining and/or reaching out to for help.

www.exitplanningforadvisors.com
http://www.acg.org/
http://www.amaaonline.com/
www.axial.net
http://masource.org/
www.mergernetwork.com