Graphite and bamboo have vastly different actions. Like Rich said, you could find a fish able graphite set up for less that what it would cost to get a new tip made. If you can find a spare bamboo tip, that would be your best bet unless you are willing to shell out some serious cash.
Bamboo rods have a special place in the hearts and hands of many fly fisherman for a reason. Not only are they enjoyable to fish, but they harken back to the days when fly fishing was a simple, skilled, art form. Hand crafted bamboo rods are sold for small fortunes right now, but before graphite came around the bamboo rods dominated the market and did not demand such high prices.
Take Red up on his offer, get an old bamboo tip about the same length and seemingly same weight. It will probably not be perfect, but it will be closer than anything graphite could offer you. If you need any hardware or finish/epoxy for repair I would be happy to supply you with what you need to get the old girl back on the water.
