One thing I also did with Google, is to type in "donation request (insert city or county.) I found some really unusual places I hadn't thought of and have been pleasantly surprised with the feedback I've had. Be sure to also exhaust your list around your area of museums, zoo/aquarium, tours of the city, comedy clubs--all of these have been very generous with both a service club auction I helped out with, and the school I'm currently helping with.