Buy it now! Mac OS X 10.5 Leopard
It appears that Amazon is accepting pre-orders for Apple Mac OS X Version 10.5 Leopard, which is scheduled for release in October 2007.
There are, as usual two version available, Apple Mac OS X Version 10.5 Leopard at $129 for a single license and the Apple Mac OS X Version 10.5 Leopard Family Pack for $199, which includes licenses for up to five Macs in your home.
If you want to be sure you have the latest version of when it arrives: pre-order now!