I would bet you are like me - the only pair of AE shoes in the entire Wal Mart.
Sorry, can;t help you on the last, but...
I've owned a handful of the maritime/kirkwood models in 9D (even 1 or 2 in 9B). Bought the USA Sea Island from Nordy Rack in 9D & 9.5D, but had to return both because they felt too tight. Without trying it on, I'd guess I needed 10B. My brannock is roughly 9.5 c or d, 5-last is 9D.
They are on the 678 last, which I have no experience with. They are shown in this catalog: (https://issuu.com/allenedmonds/docs/fall-1998-catalog) on page 23. The description of the 678 last in the catalog says that they run slightly large to accommodate a removable orthotic insert. They are from something that was called the "corporate casual" collection.
Are those the stock sole edges? They almost look re-done to me (lightened).
Way more than that. Used AEs in good condition (i.e., worn only a handful of times, nowhere near needing resole) tend to go for ~$150, depending on the model. The least I ever got for a pair of used AEs was $89 or 99, I think.
Sure - I've seen plenty of AE's selled used for over $100 - just depends on the shoe, condition, etc.. The buy/sell here works pretty well too.