I purchased this 8 oz jar of Grade A Brine Shrimp (Sea Monkey) Eggs from Amazon about a year ago and I’ve maybe used about 1/4 of the eggs already (The majority I feed to my fish. However, I add some from every batch, to my Sea Monkey tank).

Brine Shrimp Direct - Brine Shrimp Eggs: https://www.amazon.com/Brine-Shrimp-Grade-Minimum-Hatch/dp/B07QDBT88K

I keep the jar in my refrigerator, which has definitely lengthened the viability of the eggs, as I haven’t noticed an issues, in regards to hatching, etc.