You can now find B4: The Lost City in the FG Shop.
This is one of my favorite adventures, was the very first one I played in by a friend of mine for the very first time playing D&D.
If you'd like to see a review of the product (not by me) "captcorajus" does a good one here.
https://www.fantasygrounds.com/store...=WOTC2ETSR9049
https://www.fantasygrounds.com/image...8JCsUuoEjw.jpg