Dicks has the ones in Chinese take-out for steelhead, and also ones in plasic containers that say they are for Stugeon. However I have had freshness issues with their shrimp at times. Make sure they smell fresh. BTW, my best day of Steelhead fishing yet was using the shrimp marked as being for Sturgeon.
I use bc's sandshrimp..... His old frozen ones for a $1.... All he had was small ones last time I as in there doubled them up and used singles fish didn't care one of the bigger fish was on a single small sandshrimp on a 4/0. I out fished 2 boats 6 guys between them. Sandshrimp or sandshrimp and worms were money in my hole the other day. Don't think size matters