The best way I have found to get the most inexpensive parts is to go to mercruiserparts.com and select the "seach with pictures" option. They have pictures of entire sub-assemblies broken down and more importantly they have the part numbers for each part. That is key as their prices while competative are not the lowest. Take that part number and google "mercury marine part number xx-xxxxxxxx. you will get many results such as Amazon (not the cheapest) and e-bay. More often than not Boater152 on e-bay is the cheapest.
