If you use cash when you board for your seapass, I think it depends on the length of your cruise. We only used cash 1x and it was a 4 nighter on the Sovereign. Our SeaPass deposit was 250 for the cabin (2 people). This was in October 2003. Other times, I'll give them a credit card when we board but go down to the purser's desk on the last evening and pay it off with cash/traveller's checks.