before you put them up on craigs list, you may want to know if they are working or not, if they are then yeah youll make more money, but if there not your just wasting your time on craigs list. if the speakers are good sized they could contain a sizeable amount of copper wire, as for the printer i dont know never tore one apart, should have a computer board in it and the power cord, you would be lucky to sell a old used printer on craigs list, you can buy a new one for 30 dollars, and it ussually come with at least a black ink cartridge.