I want to downgrade to Snow Leopard from Lion

Hi
Can someone please tell me how I can downgrade from OSX Lion to Snow Leopard on my brand new 27" iMac.
I spoke to Apple over a week ago on the phone and explained that I wanted to downgrade to Snow Leopard and the chap I spoke to sold me the Snow Leopard upgrade disk and not the full installion DVD, I already own the Snow Leopard upgrade disk so now I have two copies and I can't use them to downgrade.
All I get when I insert the DVD is a message saying "you can't use this version of the application Install Mac Os X with this version of Mac OS X"...
Could someone please tell me exactly what Snow Leopard disks/ DVD I need to purchase (and where) for me to install Snow Leopard on my iMac. I have seen lots of different "versions" on eBay & Amazon with vastly differing prices but how do I know which disks I need to buy as I don't want to end up purchasing a third "Upgrade only" versionof Snow Leopard.
Thank you for any help you can give me with this...

I've already tried all of those methods using the 10.6.3 disks I bought, they simply don't work as I posted earlier.
All that happens is the machine constantly bleeps 3 times in a row and the DVD drive stops spinning. I know booting from a DVD install disk is a slow process but no matter how long I leave it nothing happens except for the 3 bleeping sounds.
Having scoured the net and spoken to Apple themselves all information tells me these 10.6.3 disks are actually for someone upgrading from Leopard to Snow Leopard.
I have no idea why Apple sold me this version as before I ordered it I explained fully to the sales person what I was wanting to do and they had all the details of this mid 2011 iMac I have bought. So unless the sales person didn't have a clue what they were talking about then I should be able to "downgrade" to Snow Leopard on this iMac as even the specs for this model clearly state on everymac.com that it originaly shipped with OS 10.6.6 (Snow Leapard)
http://www.everymac.com/ultimate-mac-comparison-chart/?compare=all-intel-macs&hi ghlight=0&prod1=iMacIntel041
So there must be somewhere I can purchase these 10.6.6 install disks to "downgrade". Trouble is on Ebay or Amazon where you can buy Snow Leopard most of them are 10.6.3 or "retail" versions with no actual version numbers to let me know I'm buying the correct disk.
Who would have thought setting up your computer could be a mission impossible task and why Apple don't help is simply a disgrace to be honest.

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