4 oz spirulina powder, unopened, purchased 10/23/2020 from Ken's Fish. I overestimated how much spirulina I would need to get my Moina through the winter! This is from a set of four 4 oz bags that sold for $17.50 total. ($17.50/4=$4.375, so if you're buying it for $4 or less, you're getting a deal!) You can use this as an ingredient to make your own food or to feed to Daphnia/Moina.