Squash Blossom season is peaking, again, at Windfall Farms. They'll be available every Wednesday and Saturday until we get our first frost, which is a far off thought considering the hot and humid days we are enduring. Here's the link from the NY Times Food Section regarding the Blossoms, it's still pertinent 2 years later.
In addition to the restaurants listed in the article, I suggest heading to Casellula. I ate their stuffed blossoms last summer and my mouth has been watering for them ever since!