Yeah, that's slick, but not worth the money IMHO. A couple of cheaper options:

1) Rite in the Rain has an awesome sampler deal for $12 that includes an all-weather pen (Fisher Space type), a couple waterproof notepads and some misc. copy paper. This includes S&H. I'm not sure how they do it, but I've been very impressed with the pen and the paper.

Rite in the Rain Sampler

2) There are Fisher Space Pen refills (writes in the rain, underwater, through grease, etc.) for many non-Fisher pens. I got one for a Waterman I have, and you can get them for Cross and other pens as well.

Writer's Edge Refills