Remington 158gr Semiwadcutter Lead Hollowpoint, +P, I believe the product code is R38S12, commonly available from the better stocked gun stores, and I believe I've seen it from internet dealers also. Winchester has the same offering but I've never bought the WW brand as reports I've read indicated Remington used softer lead.
Midway has it at $26.99, box of 50, their product code is 548921, you may very well find it cheaper locally.