Kyonn,
I'm sorry, I gave you a bum steer. I just talked with one of my friends.
The cruise they took, Feb 2011, was THE LAST "large ship"cruise into Antarctica on a big ship. Apparently international regs have tightened up so that only small expedition type ships can go into Antarctic waters. Future cruises on the Infinity will be from Buenos Aires, around Cape Horn to Valparaiso and back.
The fact this was the last possible cruise was incentive for my friends to hop on it when they did. She said that the future alternatives on small expedition type ships would be upwards of $15k per person.
I'm sorry to get your hopes up for nothing. Maybe you can find a small expedition type ship for a price you can afford.