This shop caught my eye because they had this great book http://www.amazon.com/Birds-Eye-Views-Historic-Lithographs/dp/1568981465/ref=rsl_mainw_dpl?ie=UTF8&m=ATVPDKIKX0DER and these great plates with a map of Fort Duquesne and the 7th ward of Pittsburgh in the window earlier this summer. This shop is expensive but there are some reasonably priced gift items here too. I also like their selection of books - lots of interesting things. Penhollows has a nice mix of art, antiques, home goods and books. This is one of the most well editied shops I have been to and I enjoy stopping by to see what is new - they put up a whole new display to celebrate the fall and I anticipate that they will change their collection with the seasons.
The last time I stopped in they had some really interesting vintage cufflinks on display as well as some beautiful art work of Western PA. It looks like the will also have a web shop too.