There is a place called Arizona Aquatic Gardens that sells them. I don't have the web address but you could google it. I think that place gets mixed reviews from folks here so you might want to ask about them first. I've never ordered from them but I know they sell them. Good Luck
these shrimp are not very common. most places that offer them are usually out of stock. they hide well and are all wild caught so i think that this is why they are rare in the hobby. i find bamboo shrimp a nice replacement. they hide and get almost as big and are also a fanshrimp.