I have seen the Pinarello bearings at competitivecyclist.com but for $44. If the bike was three years old instead of two, I'd probably just swap them, but I don't have a headset press. For that reason I would like to get the fork out without the bearings coming along for the ride. Silly question, but would it make sense to spray some lubricant on the steerer of the old stem to aid in the removal? Thanks for all the info so far. I'll make sure to take it for a test ride and report back. I'm waiting for a new 4 Axis Stem and WCS bar and I have a some Nokon's that are going on it too. It's going to be a fairly light 57cm steel bike when I'm done with this project.
A) You don't need a headset press.
B) Go to your local shop and have them call Gita, I'm sure they can do better on the price of the bearings than Competitive
C) I don't suggest using a different fork. Pinarello uses a proprietary system (no one ever said the bearings were proprietary) and it's designed with the fork as integral part of that system. ***EDIT***This is the part that precludes using another fork, the shape of the lower steerer is made so that it either doesn't use a race, or the race it does use will not work on other forks, this depends on model.
Again, have your local shop call Gita, they may have a fork for you.
D) Because it's an interference fit, the lower bearing will most likely ride with the fork, you can probably still re-use it, but it never hurts to replace them.
PM me if you have further questions, I know some folks that can help you out.