One idea for the future is to use a program like gotrythis to manage all your afiliate links then just to there to do any updates. Or you set up redirects on your own site for all the links then you only need to change the redirect and everything that points to it is changed.
Sounds like a few good ideas here to find and replace.
Just to find them, internet explorer has a find on this page feature. > edit > find on this page.
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