I had the same problem to replace a noisy fan in my wife's 13" MBP... I looked at ifixit and various other mac parts suppliers but they did all seem rather expensive.
I ended up getting one from ebay seller "cpiinc" for $13 and it worked like a dream. Any specific reason you didn't want to try eBay? The part appears to be a very clean pull from another macbook - markings, wiring, etc all identical to the original part.
eBay store:
http://www.ebay.co.uk/sch/cpiinc/m.html?_nkw=&_armrs=1&_from=&_ipg=&_trksid=p3686...no connection, just a satisfied customer.