Here in Holland ( at least that's what i've been told) unlocking doesn't void warranty..
But the moment that you debrand your phone and/or break it while flashing, then you can say bye-bye to your warranty...
And about the prices, in wich country are you talking about?
Here in Holland no company is fulling around and putting high-featured phones with prepay simock to sell...thousands of little gsm-shops over here unlock almost evry SE phone for 10 euros or less...





