Im not to sure about what other sites you would benefit from But it will depend on the location of where you family search begins here is a link to a site that is quite usfull But it does'nt give you cert's. But will give you some info ie like birth,death,marriage dates. mothers maiden name ect ect.
http://www.familysearch.org/eng/Search/frameset_search.asp
If you have any family over where you are searching then you could ask them to go to where the records are held and print you off some copys of cert's.