I was looking for a single rear bottle cage for my Fizik Tritone seat. I have the dual for training. Oddly enough, it is only available from Fizik for $30. However it is $35 to ship. That's a little steep for shipping. The small aluminum part is $99 dollars on Amazon and unavailable on ebay.

Anyone know where I can find this part?

Fizik Tritone Carriage Kit SKU: FZKSJ20000