They are wild caught. I can almost guarantee it.. Breedings are so sparse in captivity, it's probably not worth it to set up the saltwater tank for some cheap shrimp.
Email the seller and ask what the weather is like where they are.. they offer heat packs/oxygen at no extra cost so I'd take the opportunity if it isn't warm where the seller is. Of course, overnight shipping is your best bet for buying them. I'd probably take a 1-2 gallon bin, and put them in it with the water they were bagged in, and slowly adjust them over to what you have slowly.. they are adult shrimp already and so don't like changing water parameters. It may not even be worth shipping them in, not totally sure. At least at a local pet shop they'd be in similar water already. Try googling some suppliers in Cali first. Shrimp breeders are all over the place, the hobby is booming.
Okay, I will have to remember that. I will have to check a shop that I discovered as I have not found any amano shrimp. All I have seen is ghost, cherry (they were clear though), and bamboo. I would get the ten but I don't have US cash at the moment, I have mostly euro money... weird I know as I live in the states and never been outside of it.
Amanos prefer algae, but like most shrimp are completely fine with anything you throw in there. You'll need to feed them, actually, usually the algae in the tank isn't enough. Just sinking wafers will be fine. Actually a user told me their amano didn't eat any algae, just the food they were feeding their fish.. :s
They are one of the more popular shrimp species, so you should find some at a pet shop. On aquabid, I just click "all" where the page numbers are, the "ctrl" and "f" type in "amano" there's 4 listings right now. :D
These shrimp are almost all wild caught.. so many die off in the tank due to this. If you go to a petshop, select the smallest, healthiest looking shrimp. Younger shrimp are better at adapting to new environments. :D
What size of a tank? If there's enough space, they should be fine together. Shrimp usually do well with other species, unless it's a smaller tank, then species duel it out for space. 10 gallons+ should be enough for amanos and ghosts. The amanos are much bigger but much more peaceful, preferring a mostly veggie diet. They have tiny claws as well. I can't imagine a ghost shrimp trying to pick on an amano, if that's your worry. I know you plant your tanks well, so you should be fine. Though if anything happens.. the amano will win.
Also, just a note that any shrimplets you get will be ghosts.. as far as I know amanos need to grow up in brackish/salt water.