If you want to get some at the meeting you will need to set up the tank in advance. I used the product brand (Salty Shrimp) Shrimp for both KH and GH to re-mineralize the RO water. price $18 This will last a long unless you planning to do a large number of tanks. You will need A soil substrate help keep water slighty acid like 6.8 pH and stable. Jeff W recommended this product at this location https://www.discobee.com/collections/sl-aqua/products/sl-aqua-nature-soil It is enough for three 10 Gallon tanks. Maybe some people can double up. $40 I used the small grade. clump size I set up a tank and have berried female almost ready to release. These shrimp are seasonal so do not produce babies year round. I was warned to buy a big enough group. They tend run mostly males(30% female). You do not want to mix groups from different sources. They can carry diseases that can kill one or both groups.