I bought some from eBay. One of them arrived dead and the rest died within about 2 weeks
Worth mentioning in my very mature tank where my amano shrimp thrive.
So that was £20 down the drain (inclusive of postage).
Ps: also worth mentioning, but this guy
tehthe breeds them, and during this recent hot weather lost all of his adults (I read this on a specialised planted forum I'm a member of, but can't post the link as it's against our forum rules here to link to another forum).
The shrimp will boil in the bag in this hot weather if you have them posted, so I wouldn't chance it during our current weather situation.
The link provides some of his excellent photography and information on them (if you browse around his website).