One thing that occured to me - your friends might need to adjust their expectations of what is "local" and what is "in season." Local produce in the Northeast is a gourmet specialty item, not subsistence food. The locavore movement has allowed small farmers to charge a premium, and they do (more power to them, but it's hard on middle and lower-income people).
Israel is in a similar growing zone to me (equivalent of USDA Zone 8B), and I can eat fresh local produce all year from my garden, it just changes from tomatos, zucchini and okra in the summer to broccoli, chard, kale, and salad greens in the winter, etc. We can harvest tomatoes until the second week in November.
New York is much further north, and while much of New Jersey is zone 7 (not too different), a lot of the farm country in NY is zones 5-6. Local production is tapering off right now to apples, hardy greens, and winter squashes. In about a month to 6 weeks, there just isn't going to be much except out of cold storage or greenhouses (aka, very
expensive). I found this chart of what's available in season, but I have to tell you I never got corn, cucumbers, string beans, etc. in my CSA box in September-October. I think this chart is more theoretical than practical. http://www.grownyc.org/greenmarket/whatsavailable
Our CSA up there was just closed from November to April or May. Farmer's Markets may shut down as well, or change their stock to reflect what is available (more jams, craft items, etc). Your friends may already be aware of this, but if they haven't considered it, the logistics of production and distribution are really different where they live now, than where they grew up.