Yes, we still have a forum.
Actually they both look to be for sale here:https://www.chronogames2004.com.br/index.php
Also, found another music cartridge, "Opeth Music Cartridge" by FlosK, released in August of '22. It had an extremely limited 5-copy print run (which I tried to buy, but 5 months later he still hasn't shipped ), so not sure if you want to include this?https://flosk.bandcamp.com/album/opeth-music-cartridge-for-sega-genesis-mega-drive