They're still designing it, and learning to build it (building the "machine that builds the machine"). They've already scrapped booster 4 / ship 20 without even

They're still designing it, and learning to build it (building the "machine that builds the machine"). They've already scrapped booster 4 / ship 20 without even a test flight. Today's rocket was a byproduct of what they're actually working on, so it's hard to pin a price on it. I'd guess a few million dollars in engines, and a few hundred thousand in steel? This is all stuff they would've needed to find a way to dispose of anyway; the next booster in line (B9) already has hundreds of improvements. Among these are improvements to thrust vector control and engine shielding, both of which were involved in the issues with today's flight.