Anyone know how much 2nd hand computer monitors sell for??

[SockThing]

I have a Proview 14" CY-465 monitor, thats all I know about it!! Tried searching on google and found lots of the same monitors but no price. We have had it about 3 years and don't need it any more as hard drive broke and we now have a laptop. Also have a bog standard keyboard, do people buy these 2nd hand??
Thanks!