There's also the hassle you'll need to go to to get another one. Shopping for a day or two, buying, getting it delivered. I think my second hand one was about 150 all in and a pain in the arse to get up the stairs. Remember they can get it chucked for 50 and lots of people will if they think you're taking the piss or being greedy. Offer 75, be willing to go to 100.