Joe, it'll be tough to get walleye by fishing for them in PA in the size range or sex you want. PA's season for walleye isn't open during their spawning run and when it does open, the minimum size limit is 15". If you are looking for just a small number for your pond, you may be able to get some shipped to you from Jone's in Ohio. It may be pricey by the time you throw in shipping though... However, if I recall correctly you're on the western side of PA, so the shipping may not be as bad as it would be for me here in VA.
If you ever want to see something neat take a trip to Raystown Lake around April and go to Great Trough Creek State Park. If you go down to the creek at night, all the walleye pile up below the small dam that is on the creek. Shine a spot light into the water and you can see many walleye stacked up there spawning. It's closed to fishing but surely impressive to see with their eyes glowing brightly... The PA Fish Commission has plenty of Waterway Conservation Officers spying on you there, fun to watch guys get nabbed for poaching the walleye.
http://www.fish.state.pa.us/images/fisheries/afm/2005/7x04_25trough.htm
