Jimmy from Salehoo has written a great response to this question here: Link hidden: Login to view
Essentially, you need to look at liquidation/closeout and Chinese suppliers to find products that enable you to make a profit.
Have a flick through the General section on this forum. There is a lot of helpful information there. Many other people are also facing this problem but there are solutions. We recommend taking a look at Link hidden: Login to view to start.
All the best :)