might repower

hearing from lots of folks that my 92 johnson 175 ,if i ever get it fixed is a major gas hog. so i am thinkin instead of having it rebuilt i might look around for a used motor instead. i am thinking a 200 might do better since it doesnt have to work as hard. i am scared of buying anything local since katrina. anybody out there know of any sites online where i can look for a used motor? tx