I recommend buying a subscription to US News & World Report's online business school guide. It's only about $15. First, check out the top marketing schools. Be warned, however, that many of them are higher-ranked schools.
Next, check out their list of 100 top schools. You can organize them according to different factors, such as GMAT ave and cost. I like the comparison feature, where you can choose up to 6 schools and then get a nice table that shows all the data.
http://www.usnews.com/usnews/edu/grad/r ... _brief.php