Apple Logic Pro /LogicExpress Discussion

Hello all,

Any ideas where I could find a second hand Logic 5?  I'm stuck on 
Windows XP and having used Cubase for a couple of years, would like to 
go back to Logic.  Trawling the net came up empty so if any of you know 
of a source for this now rare software, please let me know.

Thanks in advance,

Brian.