First off, you can't compare a pulley-replacement to a full timinig-belt replacement kit from a reputable vendor. :crazy:
When performing this service on a V6 you should replace both the timing and accessory drive belts, tensioner and idler rollers, the thermostat, and water-pump. Don't forget a full coolant flush! Without the coolant, the dealership normally charges in excess of $390.00 for parts while ECSTuning offers the same kit for less than $260.00 for the same OEM components. This is one service which shouldn't be done half-azzed because we've seen a few members replace just the belts and in time one of the key components fails and causes thousands of dollars in damage.
Just something to think about...
Good luck,
Will aka The Swami