A friend told me about Roadrunner Sports over the weekend. He said has been nothing but impressed with their customer service and return policy.
I signed up for their email notification and the welcome letter said that shoes can be exchanged within 60 days as a part of their Fit Garauntee.
Their VIP club is about $40, but you save 10% and get free shipping on your purchases. If you think about it, if you buy four pair of shoes a year, you would break even.