Since you are in the public school system and maybe limited as to where you can purchase items see Carolina Biological.

https://www.carolina.com/freshwater-animals/ghost-shrimp-living-pack-of-12/142476.pr

Their ghost shrimp will be the PK shrimp aka Mississippi grass shrimp Palaemonetes kadiakensis,,, aka ghost shrimp, glass shrimp. Very similar anatomically to P. paludosus. It takes close examination of the rostrum to separate the two species. Carolina may know the species???? Maybe not? As noted they are also available in eBay.

https://www.ebay.com/sch/johns796/m...p;rt=nc&_trksid=p2047675.m3561.l2562