So you dont want to support a corporate giant like Amazon but you do want to support corporate giants like HMV and Blockbuster ?? How very ethical.
If you're such a fan of the high street then you'll find your blu-rays. There's still shops out there to buy them from. Have a walk around, you'll see them.
If you want to come into the 21st century and start using the internet, there's even more places to buy them. You've got the whole world at your fingertips and you don't have to use Amazon.
If you want your blu-rays that much, get off your arse (or onto it) and get them.