Just to update: I just tried calling GP and was told that there is still no availability for tomorrow using a FFN. I have no idea why it's available for a night that goes for $292.50 but not one that goes for $234.

On a side note, I am very grateful that I can get someone at GP on the phone in just a few seconds. No way I would call back about this if I had to wait on hold for a long time.