[QUOTE=wearyourtruth]your LBS is a great place to pick up a cog. surly, dura ace, whatever... they can probably get it for you. they are only $15 or so, so if you got a "deal" online you might get it for $10... support the LBS!
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My LBS just charged me $30 for a 17t surley cog. Did I get ripped off?