N950 is only for developers, they have that as loan from Nokia, it is not theirs to sale. but, some of them done that. N950 is not so superior to use as everyday phone, battery is weak, GSM signal is not well in "outside of the city" areas, has no NFC, an we could continue in naming some "not done so well" things on this pre-sale prototype. But, for deleopping, it is actually very superior device you can de-bug on device with all possibilities of QWERTY keyboard, you can code, you have access... so, the price depends on how much used is device, what are conditions, but count 500+ €, even higher than 2000€ sometimes.