Their announcement thread: https://bitcointalk.org/index.php?topic=1926269.0
Website: https://mona.co/

Be aware about anything suspicious. IMO they look legit but there is always a chance they may be just another ICO scam.

https://steemit.com/scam/@atlasminer/monaco-card-ico-possible-scam-alert
https://steemit.com/monaco/@montehansen/beware-of-monaco-visa-ico-s-management