Painkiller Redemption is a new stand alone expansion pack for the Painkiller series which promises dozens of new levels in a seven to ten hour campaign with over 6000 "uniquely spawned monsters."  The best part about this expansion, which supports four player online or LAN co-op, is the price - $5.  A little math reveals a CPDM (Cost Per Dead Monster) ratio of just .083 cents - seems like quite the bargain to me.