In addition to asking parents and mentors for contacts, remind them to look into their own company's methods of giving. Some will donate on their own. Other will give "in kind" or "matching" donations.
Also, look into E-Scrip (
www.escrip.com) and Ralph's Club (
http://ralphs.com/ccprogram_about.htm). These are nearly effortless ways of raising money. The one catch is that RC pays out quarterly, and I believe E-Scrip may be the same way.
indieFan