Using google, I found it on Curseforge. It looks like it was taken off of Curse because of it being so old.
http://wow.curseforge.com/addons/baud-auction/ You can get the latest version from there and then apply the fixes in the forum thread linked above.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff,
The Tao of Pooh