I actually found it on Etsy while searching for Pokemon romhacks and picked it up on an impulse buy from a shop that had one copy and is now closed, lol. I hadn't yet found the legitimate shops for stuff like this, but now I know what to look for 👍 the ROM seems to work well so far, though I've been working and haven't had a chance to get far. I'll be back here when I get paid because gameboy dev is my new special interest and I want to support the community, and I'll definitely keep an eye out for the official carts!