Drop shipping is for single or small order processing so it is what you need. You list their products on your site. You get the order and submit it to the supplier. They send the order to your customer with your logo or white label packaging. You have billed the client at checkout and the supplier bills you when you place the order and the difference is your profit. You can find wholesale drop ship suppliers like DSDI mentioned above at http://inventorysource.com/

You can learn how to get started with a drop ship supplier here: