I would agree with FrogOnFire, best bet with old tech is to find someone you know who has a use for it. Strangers probably won’t be worth the hassle of selling it. This all assumes this wasn’t a super high end model when you bought it. If it was then go for ebay/craigslist.
One other place I would recommend is NotebookReview Forums. There is a Buy/Sell section where you might be able to work something out. There is a minimum post requirement before you can sell though. I find places like this to be more trustworthy then ebay/craiglist.