Hi, I don't know what it's worth but a question that comes to mind is: Is it the ED version?
If it is ED, this would improve the view and put up the cost.
I have the ED version myself and really like it but I use HDF eyepieces which are much better than the HR ones. A lot better to my eye. If you do buy it I would recommend that you sell the HR e/p and get an HDF one.
Great little scope if you don't mind it not being waterproof. And it's lighter weight than the newer MM3.
I sold mine on Ebay with a fixed 25x (I think) lens last year for £105. It was in excellent condition and had the grip-style case. It wasn't the ED version. I think for that sort of money it's a decent little travel scope - I was using mine with the HDF 12-36 zoom which I think did make a considerable difference to the view, though it cost around £100 just for the eyepiece secondhand; you could always upgrade the eyepiece later though.