There's also a Nuts to You around 7th and Walnut. Sue's Produce has a nice selection of nuts and seeds. Whole Foods has a lot in their bulk section, which is perfect if you only need small amounts (like if you are making granola). Thank you.
Try Wricley Nut Products Co. in the food distribution center on 4th & Pattison Avenue. A little out of the way, but buying direct makes equals really great prices. My grandfather goes faithfully for Christmas every year for pistachios and chestnuts. 215-467-1106