I've given a little bit of thought to SRB costs for a presumed shuttle
derived vehicle (SDV). Given the contract info I found (Google is great), it
seems that costs per engine (fabrication, processing, refurbishing) amount
to about $40 million per engine. Also, what I've found seems to suggest that
NASA has ordered 240 SRBs to date (may not all have been manufactured, yet).
So, if SDV is built, I wonder if existing SRBs would be used and what the
cost would be of simply refurbishing what is there? Anyone have any wild
guesses?

Jon