As ual902 asked in a PM, and also on another thread, what are the tips about booking a cruise to Antarctica? I am happy to answer any questions you might have.
1) Should I use an agent? Agents know many cruises but, of course, they are sales people, so you must find one you trust. I found some real duds, but one I liked,--which I didnt use because they could not get me a slot on the ship I wanted (and which I got myself via persistence with OneOcean directly)--is an agency in Bend, Oregon (of all places). polarcruises.com Lynn, from PC, was on our cruise too so she should know what she is talking about from firsthand info.
2) Price to pay. Expect 10K and up. But depends on ship, itinerary and time of year. You will need to read up and determine what you want to see and what is important to you. Pay attention, ual902!: if you just want "bragging rights", you can find a cheapish tour, like the big ship Hurtigurten, which will tick your box for you. If you want something special---more whales, 3 types of penguins, penguin chicks, etc, etc---you will need to read books and do research. Lonely Planet can help.
3) Tradeoffs: the biggest tradeoff is size of ship. Under 99 passengers can basically go anywhere, but the passage can be rough. Over 200 is a problem, because they have to take shifts for landings. (Over 500 cannot land at all) OneOcean RCGS Resolute was fine for me because it was basically a cruise ship and had special gear to make for a smooth journey (which was important to my sensitive stomach)
4) Saving money. I think this should be lower priority but, because we are DD readers, we cannot help but try to find a better price. :-) So, three ideas for you: (1)go early or late in the season. It will be colder but so what, you get maybe more animals. (2) Go to Ushuaia and wait a few days and bargain for an empty cabin...going rate was $5600 for Quark Expedition boat with similar features to ours and which went out just before Dan's (3) organize a group of 12 friends and you can be their free leader. (Not sure if 12 is correct number...maybe SF can verify) (Bonus 4th): It's not clear to me that going directly to the provider will save you money. They have their own sales reps too and. apparently, agreements to not undercut the independent agents (see #1). Also, once you ask anyone about a particular cruise and give your name for a tentative hold, all the other agents may be able to see that you are working with someone already...makes shopping around a bit tricky....
If you have questions, I can try to answer here.
ETA: Bonus 4th money saving tip