One isolated example, but I happen to need one due to ham-fistedness and not using my torque-wrench.
A single brake lever bolt for a Formula R1 for £9.99 http://www.ebay.co.uk/itm/Formula-Disc-Brake-Lever-Clamp-Bolts-R1-and-THE-ONE-RED-1-Bolt-FD-V123-05-/160890910527?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item2575d8773f
Two such bolts and the clamp for E17.00 http://www.ebay.fr/itm/Formula-R1-demi-coquille-clamp-kit-SILVER-FD40119-20-/140716121610?pt=FR_JG_Sports_Cyclisme_&hash=item20c3559e0a
I don’t know how much the clamp costs but the French one is less than half the price even without it!
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Just thought I’d share that.