Which disk do I need?

My Macbook Pro (late 2011) came with Lion installed and I want to downgrade to Snow Leopard. I don't care about saving my current data, I just want a clean install of Snow Leopard. My issue is I don't know which OS disk to buy. Do I need to buy OS X Leopard, install it, then update it to Snow Leopard? Or can I just buy the Snow Leopard disk? The Snow Leopard Disk on Amazon is only $49 and the Leopard disk is around $150, so that's why I'm thinking that the Snow Leopard disk is not the full OS. My computer didn't come with any disks and I'm kinda new to Macs so sorry if this is a dumb question. Thanks

Far as I know, only the Early 2011 can be "upgraded" down to Snow Leopard.
No retail verions of OS X install disk will work on a Late 2011, even on a Early 2011, as they can with machine specific 10.6.4+ disks.
The 10.5 disk is expensive because it's  rare and Apple doesn't sell it anymore.
All I can suggest is going over to MacRumors and hopefully someone knows something that's all packaged up for a Late 2011, but your taking your chances and voiding your warranty/applecare.

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