Karle,
I made it up! I was thinking if you found someone with same size and also need two sizes you could swap out the extra shoe. I think I saw something about a service that matches people that way. I am glad to hear you don't need two whole pairs to get a fit.
I also like shopping for shoes with a friend who also has issues for some reason even though I shop for clothing alone. Maybe it is that the frustration level is helped by my friend being there. Sometimes when they buy I get a vicarious thrill!
I totally understand re the narrow issue as one with really narrow heels and fairly narrow feet. I find the very expensive Italian shoes the best I just shelled out big time for a walking shoe but am thinking they will outlast the three regular pairs they cost and get more "playtime". Cost per wear is my mantra....