Giganteas are very hit and miss. They are also a very difficult anemone to keep. Many people who are considered very experienced anemone keepers can have a very difficult time with them.
When I saw your post, my first thought was, "if this guy doesn't know these very basic things about gigantea carpets, then he has no business trying to get one."
I am not trying to be mean, but unless you have a great deal of experience keeping anemones and know a lot about keeping giganteas specifically, you should not attempt to keep one.
No, they don't ship well at all.
They come in a variety of colors: brown, neon green, teal, blue, purple and even red.