The fact that the background is white helps a great deal in terms of cost. But I second Erica's recommendation (barring the perfect solution which I am sure will follow) for Minuteman Press. When I'm getting something done in town, I have a local printer I know that I give a lot of business to. Local print shops are awesome if you find somebody you know. But I've had good experiences with Minuteman when I've had to print stuff for a client in NJ.
Can you get any credit for being a non-profit? If you DID go to a place like Minuteman, maybe that would help. Or a local place that would give you a discount for getting a bit of free advertising on the air.