Well it really depends on each domain...

Here are the minimum prices:

lazyzone.net >> I'm asking 650 € minimum, it has 5900 link back and has been appraised at 1600 $ by dnScoop

gamerzscape.com >> 50 € minimum

hotspotwarez.com >> 100 €

corefiles.net >> 100 €

rankbots.net >> 50 €

luxclan.com >> 100 €

shadowofnothing.com >> 100 €

soccer-lovers.net >> 50 €

hackstyle.net >> 50 €

it-square.biz >> 50 €

apnicommunityz.org >> 10 €

gamerzscape.com >> 100 €

federalcommand.net >> 50 €

gamerzmist.net >> 50 €