Not familiar with the Pittsburgh area at all. For the Philly area, there is 'fabric row' in Center City (downtown) but not much there in the way of quilting fabrics. All of the 'quilt' shops that I am familiar with are outside the city limits. Most familiar with those in NJ. Some not too far from Philly but not sure what time/distance constraints you may have. If you are interested in those - give a holler and I'll give you what I know for sure.