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"For Tiger users with an Intel-based Mac, the Mac Box Set includes Mac OS X Snow Leopard, iLife '09 and iWork '09 and will be available for a suggested price of $169 (US) and a Family Pack is available for a suggested price of $229 (US)."

http://www.appleinsider.com/articles/09/06/08/apples_mac_os_...

$29 for a single license of SL. $49 for the family license.

Also, it's important to note that Snow Leopard will only run on Intel Macs.

Those are upgrade prices from Leopard.

Previous OS X release discs allow you to do a clean install from a wiped hard drive, although they all were much higher priced ($129).