Amazon is now taking preorders for Apple’s Mac OS X 10.6 Snow Leopard Upgrade for $24.99 with Free Shipping, with release slated for August 28, 2009. Sales tax is added where applicable. That’s $4.01 less then what Apple is charging for Preoders of OS X 10.6.

This upgrade is only for Mac OS X Leopard users with an Intel processor. Amazon also has a Mac OS X 10.6 Snow Leopard Family Pack, which will upgrade up to five computers, for $43.99 with Free Shipping. Or, get the updated Mac Box Set, with Snow Leopard, iLife ’09, and iWork ’09, for $149.99 or the Family Pack for $199.99 with Free Shipping, required if you’re looking to upgrade from OS X 10.4 Tiger or previous.

If you bought a new or factory-refurbished Mac on or after June 8, you qualify for Mac OS X Up-to-Date. That gets you Snow Leopard for $9.95 with Free Sshipping.