On the Sealand stuff, I've gotten prices already.
This youtube video shows the vacuum generator/tank cassette system I wanted to use. It is the black square ended thing with the yellow rectangle on it at the side of the compartment. He talks about it a tiny bit at 1:20.
At a 1:55 into this video you can see the cassette being removed.
Looking at current literature I didn't see it mentioned in the 2013 brochure.