AGWAY pine bark mulch is what I use. There is one in West Chester, PA and one in Clayton, DE. The west chester is closer. It's a good idea to call and see if they carry it. If they don't, they may be able to order it for you. Another I've used is Frey Brothers (Quarryville, PA) Claybreaker. I do not add peat when I use the latter. Good luck.

Thanks!! I was going to take a trip up to the West Chester Agway soon. I'll call first now :)