The following is an excerpt from the CoachStart Manual.

What can you offer the speaker-seeker?  (e.g., free talk, talk with a money back guarantee, talk in exchange for a testimonial, workshop, keynote for conferences?)  Most talks in the beginning are free to service groups, associations and such.

Also offer to supply an article or a series of articles, for the organisation or company newsletter.  What a great way to consistently get in front of an audience — and for free!  It also gives the audience a chance to warm up to you before you speak to them.