In most suburban/city areas, you will find almost exclusively short bed trucks for the simple fact of people don't want to park that long of a truck in the mall or grocery store parking lot, plus most of them are people movers anyway.
I have the "long bed" F-150 crew cab (6.5' bed as opposed to the normal 5.5' bed) and I have only seen less than a handful, and I live in a metro area of more than 4 million people. I will admit, that extra foot makes me park farther out in the parking lots because it is harder to navigate most parking lots, but at least it minimizes my chance of getting door dings.
More than likely, to get close or exactly like what you want, you're gonna have to special order it. I know that here in Texas, there will be a greater chance of finding a long bed in the more rural farming and ranching communities as opposed to the bigger cities.