Years ago, in the late 80's and early 90's IIRC, there was a company named SRP that made complete replacement Ti bolt sets for several high end groups like Dura Ace and Record. The cost was well over $200 and the savings was about 50 grams. Apparently sales weren't very brisk.

Note to Biketanium: 304 SS isn't chosen for it's strength but for it's corrosion resistance. And the market for $3 water bottle bolts can't be very strong either.