1. Tripe
2. Zucchini 
3. Eggplant
4. Liver (I may need to revisit this one, though...) 
5. Okra

Sept-Oct in Pennsylvania is the best time for fresh apple cider donuts that you get at an orchard that fresh presses the cider. Not that that alone is worth the trip here, but, if you're even in the region at that time, there are lots of fun harvest festivals that go on, especially at places that have very large corn mazes (though I prefer the term maize maze). The typical ones are in Lancaster Country, also known for the Amish in the area.