Here are the prices at my local grocery, followed by the average price calculated from the comments:
a gallon of generic skim non-organic milk $2.65 ($2.60)
The highest milk price in the survey was $3.61 (New Jersey); the lowest price represented was $1.99 (Southeast).
a dozen large non-organic eggs $1.29 ($1.64)
The highest price of eggs was a whopping $2.99 in Southern CA (though my sister-in-law said they're usually on sale for $1.99); the lowest price was $1.08 in a Midwest suburb.
a loaf of generic white/wheat bread $1.29 ($1.70)
These prices were the most varied: the highest was $2.50 (again New Jersey, but a different commenter, so likely a different area) and the lowest price was 79 cents in the eastern Midwest.
bananas per pound: $ 0.49 ($ 0.62)
Banana prices ranged from 79 cents/pound (a Midwest suburb and once again, New Jersey!) to 49 cents in quite a few places.
Personally, I was intrigued to see that my local prices for milk and eggs were higher than a lot of other places, especially considering we are a very agricultural region and have a major dairy just down the road. However, my local prices are still below the averages calculated here so I can't complain. I have to give a shout-out to all the New Jersey-ites (New Jersians?!) for having high prices across the board!
I know this wasn't a very scientific survey, but it was interesting to me nonetheless and I appreciate all who participated. I hope you also enjoyed reading these comparisons!