They are not triops, as the op noted, but triops are not only easy to grow, they are also terribly cannibalistic! Here's a non Amazon link to buy them from a small business https://sciplus.com/prehistoric-triops-kit-aka-dino-shrimp/triops are cooler though... (also i changed my link to your link)
They're baby horseshoe crabs lol
shhhhh
They are not triops, as the op noted, but triops are not only easy to grow, they are also terribly cannibalistic!
Here's a non Amazon link to buy them from a small business https://sciplus.com/prehistoric-triops-kit-aka-dino-shrimp/
triops are cooler though...
(also i changed my link to your link)