In a surprise move, Apple has made Mac OS X 10.6 Snow Leopard available again on Apple.com. They had removed the product entirely from the online store sometime earlier this year. With its return, Apple has dropped the price to $19.99, down from the original price in 2009 of $29.99. To perform a fresh retail installation of Mac OS X without having access to a Mac check out iBoot + MultiBeast and the Simplest OS X Installation Guide.
10.6 Guide: iBoot + MultiBeast: Install Mac OS X on any Intel-based PC
Simplest OS X Installation Guide
Install Mac OS X 10.6 Snow Leopard on Ivy Bridge Based PCs
Alternate Method: Purchase 10.6 Snow Leopard DVD by Phone