I bought one from amigastore.eu recently when purchasing a Gotek drive. I've not tried it out yet as I have been using the Gotek internally, but I imagine it will work for your needs:
https://amigastore.eu/en/440-amiga-e...dapter-m1.html
If you are a DIY kind of person, I see you can get the above cheaper from ebay:
https://www.ebay.com/itm/Commodore-A...T/264231556257