Price for a Denon 6.5 system and Bose speakers

[House]

Hi, I have been offered the following system to buy from a friend -

DENON
DCD-6.5 Stereo CD Player
PMA-6.5 Integrated stereo Amplifier
TU-6.5 AM-FM Stereo Tuner
DRR-6.5 Stereo cassette tape deck
DMD-6.5 Minidisk Recorder

Bose Acoutimas 3 series IV speaker system

Neither of us have a clue as to its current value, would anyone be able to tell me what you think a fair (mates !) price is ?

Thanks.

[House]

Any help please ???

I really am clueless on these things.