In the Spell, Item, and Monster listings, you can filter by source.
Would you be so kind as to describe how? I have a search result page up right now, and can't for the life of me find any kind of 'filter by source'. I can filter by "major category" (characters, spells, monsters, items, etc.) but can't figure out how to filter by source. Thank you if you can help further.
I believe what he's saying is within the monster listing and such you can filter a source, not in the search bar. If you go from the main menu > Monsters > Official (or Spells > official or Items, etc.) you are brought to the database. From there, if you hit advanced filters, there is a box for "Source" -- as well as several other filters.
In the actual search, no you cannot filter by source still.