I think I can probably out-trump you on component cost.
Alaina, whom I think you have probably met, has re-taken custody of the CF Scott she originally gave to me or, more to the point, having built up the repaired frame into a bike, I gave it back to her as I was hardly using it.
In the process of swapping saddles, she mislaid one of the M4 barrel nuts which secures the saddle to the Easton CF seat post I'd fitted to the bike.
I emailed Easton in the US and their distributor over here in the hope that they'd pop an M4 barrel nut in the post to me.
But no. I've had to buy their bolt replacement kit costing £26.74 (inclusive of postage) containing 13 parts which I do not need, and 1 part which I do.
At 6g it is probably the most expensive component I've paid for. Ever.
The alternative was to buy a new seat post, now reduced to £55.00 from the ~£90.00 I paid five years ago.
Grrrrrrrrr......
ETA - And yes, I did try extensively to source the barrel nut elsewhere, without a result which matched the spec. of the original.