Any shop that specialises in running, where do you live? Try googling for specialist run shops in your area.
If you're wanting to get a pair of shoes fitted you'll need to set aside 30-45 minutes, took me nearly an hour because I'm an indecisive git. The process can feel rather odd but don't be embarassed by it and they will more than likely ask to see you run. Shop I used filmed my feet as I ran so they could better explain what's happening.
It is a very good idea to get your first pair fitted under advisement like this, you'll prob have to pay the full RRP for your trainers, but once you know what sort of shoe you need you can shop for a cheaper pair next time. Most trainers will last for about 400 miles, or so they reckon.