Eric Borneman's Coral Ration

[KwajRocks]

I am trying to mix up a batch of Eric Borneman's Homemade Coral Ration he outlines in his "Corals" book. I have collected all the items except for the Aquarium packs of Fish Roe and Sea Urchin. I am having trouble locating a source for these. If worse came to worse, I can find the fresh versions at my local Sushi bar, but not an aquarium pack. Does anyone know where I can get these items? Thanks so much for the help!