Most dropshippers have a free trial period, so you can see how well the service works for you. You could have as long as 60 days to request a refund, depending on the terms of the dropshipper's satisfaction guarantee. Again, it's important to check the reputation of the service you're considering - because all of the guarantees in the world only count if the company actually honors it (and there are some that don't do a very good job of that).