It's about £85 for the install disks for Leopard, at least it was last year. As the other contributors have said, once you have the disk then you can install it on multiple machines (although I think there is an upper limit).
@andyp started
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It's about £85 for the install disks for Leopard, at least it was last year. As the other contributors have said, once you have the disk then you can install it on multiple machines (although I think there is an upper limit).