Check out the popular restaurants in your area - many have programs where they will donate a percentage of your bill to the charity or organization of your choice. Or you can ask them if htey would be willing to host an event for charity or donate a percentage just for your org or for all greek sin the community.
Panera has a great program, called "Operation Dough-Nation" or "Dough for Funds"
http://www.panerabread.com/about_community.aspx
Baja Fresh coupon fundraiser idea - It's easy. All you have to do is show up, eat, and we will donate 15% of the net proceeds from the event to your organization. Contact the Restaurant Manager at the location nearest you and begin planning your next fundraising event today.
www.bajafresh.com
This is an idea from the Melbourne Alumnae Panhellenic - A local cheescake vendor was contacted, order forms were prepared, marketing was conducted, and the cheesecakes were delivered to the April meeting, labeled for each buyer. This APH earned $4 for each cheesecake sold, with "very little work on our part."
This could be done with any other food or flowering items.
And here is a great index of DIY fundraisers -
http://www.fundraising-ideas.org/DIY/index.html