The members market is a very good place to buy and sell computer and audio visual equipment as you can see how long someone has been on the forum and it operates a trust feedback system. There are strict rules around what should go in the advert (e.g. price drops at certain times) when selling so familiarise yourself with them. But this makes it generally a safer place than somewhere like ebay. You will also generally seem for less than ebay although there are no fees involved. Companies are not allowed.
Scammers are not unheard of, of course, but I would personally use it over ebay. Also be aware that it's fairly standard for new users with little or no " trust" to be asked by a high trust buyer to send the item before full payment (e.g. half payment, then send item, then the remaining payment).