Those that are really good are usually in demand, so they wouldn't care if you think their fees are high or not - they just won't stay.
If possible, however, I suggest that you check them out in person. You can search the immediate ROI, accessible at how you can cut fees. http://www.balancingelement.com/__media__/js/netsoltrademark.php?d=sites.google.com%2Fview%2Fhowmuchdoesitcosttohiresomeone%2Fhome