I needed help picking out running shoes for my horrible fat flat feet and I came to runner's den on a whim. I could not have been happier that I did. The sales associate that helped me with it spent an inordinate amount of time helping me try on shoes and assessing how they were on my feet. Its not hard to see why they've been around since '74. I may have tried on half a dozen shoes before I finally settled on one and during the entire process they were patient and courteous and I did not once feel rushed to make a choice.
More importantly they are a local store that is integral to the running community in AZ. They also have a Runner's Den Training Program for those who want to train to get to be able to run a marathon. The reason I mentioned this while you may be able to get a shoe from a store online or another big box retailer at a few percent cheaper it really does not do justice to the level of service and understanding that you get here.