First off, depending on what your Page Rank is (PR) as many webmasters want the site based on this and also (at a minimum) the content and name of the domain as well, you won't sell it for nothing.
Secondly, send emails out to friends and college friends. Also be sure to check out the forum here on v7n to sell your site and see what members think of it and what they feel the value of it is.
Thirdly, don't ever use a script to tell you what your site is worth, it's never accurate
Most of all don't ever let anyone under value your work and time spent in advertising to get it for cheap. You will never be a good sales man (or woman) if you are not honest with yourself.
Best of luck!