Shimano front axles on eBay....
 

A very good price for 600EX front axles. These will interchange with most 105 and Dura Ace axles with a similar seal design.

If your the type who like to have back up/spare parts these are a good buy. I ordered 2 for myself and saved a little on shipping. I have NO affiliation to the seller.

http://cgi.ebay.com/Shimano-600-EX-F...ts_Accessories