IMOP, the putter, is the most valuable club in the bag, so I would pay as much as any other club, including my driver. That said, I have been fortunate to find both the driver and putter in like-new condition and at excellent prices in the pre-owned section. If you are patient, don't mind using the previous model release (if necessary), and are a frequent shopper at your favorite golf store, it makes finding great value much easier.