When I installed Tiger (erased HD) I didn't know that Tiger doesn't have Garage Band, so now I don't have Garage Band. Seems like the only way to get it back is to erase the HD, then reinstall Panther, then reinstall Tiger .... Can't do that ....

Is there any way to get back Garage Band without having to pay for it again? I already paid for OS X 10.0, then paid for OS X Panther, then paid for OS X Tiger ... Do I have to buy OS X Leopard, just to get Garage Band? Also need iMovie, and probably several other applications ....