Searching for “scholia” in Google or Google books is disappointing. But try searching at Archive.org! This search, http://www.archive.org/search.php?query=scholia, gives a huge list!
Did anyone know there were scholia on Suetonius, Vitae Caesarum? I certainly didn’t!
UPDATE: Oh bother. The “scholia” on Suetonius is merely a modern set of comments in Latin, not ancient scholia!