Urban Garden?

I'm not sure if this is appropriate for this forum but I thought I would tap into the braintrust.

I live in Chicago (city dweller) and have some room on my roof deck for a vegetable garden. In an effort to grow some of my own produce, I've purchased 12 Earthboxes (self watering container system). I'm planning on planting tomatoes, onions, lettuce, spinach, strawberries, green beans, green peppers, hot peppers, zucchini, cucumbers, and broccoli.

Question:

-Does anyone know where I can buy starter plants for the above mentioned in the Chicago area (Farmer's Markets, Nurseries, Garden Centers, etc.)?

Thanks for any help you can provide.