okay two questions New or Used.. If thier used pass on that automatically, If someone is trying to get rid of them its because they beat them to hell.
Now with that said ill give you some personal experience, if you buy cheap your going to get cheap quality and they won't last you. and if anything goes wrong with them your going to end up paying for more than its worth. My advice is do it right the first time so you won't regret in when it breaks and realize you should have saved your money....
so you can take it or leave it overall its your choice and some lesson's you just have to learn on your own.. The choice is yours