You need to factor in all your expenses, listing fees, selling fees, the lot, including the cost of your item.
That will give you a base line to see what your total cost is, then you need to compare other sellers to see if you can make margin.
Most will drop ship products on a Buy It Now auction, because you stand to loose money if you kick your auction under valued.
You also need to consider your expense in the event that the item doesn't sell, that is a weeks listing fee already gone, so then you are already behind the eight ball trying to recoup your money.
It's not all plain sailing, I would be getting as much advice from drop shipping members as I could, because there are serious pitfalls you can end up breaking your financial in if you're not totally researched on the topic.
Remember, it's you the seller that stands to loose money if it doesn't go as you plan, not the drop shipper. It's also you the seller that has to provide customer service to your buyers, not the drop shipper.