Make Bootable USB flash drive for Tiger, Leopard, Lion, Mountain Lion, Mavericks OS X - YouTube
Amazon.com: MacOS OSX Installer 10.6 Snow Leopard on 16gb USB Bootable Drive - System Recovery Kit (Install, Re Install, Fresh Install, Upgrade)
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MacOS 9-in-1 USB Recovery-Install Disk - Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion, Lion, Snow Leopard, Mac OS X USB : Amazon.sg: Electronics
How to Create a Bootable USB Drive With OS X Snow Leopard