I'm sure the ones on ebay for $55 are legit.
If you don't mind silver, here's a set for $52 (spend another $100 and get 10% off your order):
http://www.chainreactioncycles.com/u...FQ3hQgod2HIAfA
In my quick search, I also found that they make 105-C's in carbon now for around $130. Wonder what the weight difference is between those and my dura ace pedals?