They are listed for sale here for a quid a pop (it's exactly the same part for the 6700/Ultegra as the 5700/105):
http://www.farnhamcycles.co.uk/shop/c/271-STI-Lever-Spares/
Otherwise you could try asking in a bike shop as they might well have some unused spares knocking around from building up customer bikes.
@Regal started 12 years ago
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They are listed for sale here for a quid a pop (it's exactly the same part for the 6700/Ultegra as the 5700/105):
http://www.farnhamcycles.co.uk/shop/c/271-STI-Lever-Spares/
Otherwise you could try asking in a bike shop as they might well have some unused spares knocking around from building up customer bikes.