AMX $300 you can book with your TA and just all payments must be on AMX. Any AMX card as long as you own an AMX Platinum card. HOWEVER, this is fast becoming almost unusable. With Regent and most cruise lines it is not valid with almost any other offer. Most cruises have some kind of offer so it is rare now we can add the $300 AMX credit.
The Chase Sapphire Reserve is the most popular card with our clients right now.
If you sail on Regent the best bang for the buck now is to buy 100 shares of NCL stock that gets you SBC on every cruise. Amount varies depending on the cruise you take. This is works with almost all Regent cruises. Stock is very low right now as well so a good investment for the future. You have to fill in a form and prove you have the stock but once you do it once it is pretty easy.