Your best bet is to look locally. If you want large pieces your are going to pay a ridiculous amount for shipping and it will be cheaper locally. I would just called around and find it locally. I am from Omaha Nebraska and when I checked the phone book I found over fifty glass places. Not bad for a city of half a million people. I imagine there are allot more in Philadelphia. I found a place that sold me 9 square feet of quarter inch glass and a square foot of quarter inch acrylic all for 10 bucks. Don't be afraid to call some of the glass places that do commercial buildings. That's where I got mine from. Hope this helps.