What I did when I first got into shrimp (rcs were the first ones) was shop around at a few stores and show up on shipment day and pick out 1 or two of the best. After a few months of that I had a healthy population of decent shrimp. Honestly if you can find a place with that gets large shipments in weekly and sell their shrimp at a close to decent price ($3 for a high quality PFR is not great but not the worst) you should be able to get a few great shrimp in a few weeks. Just learn what day and around what time their shipments come in. I like to buy them out of the bag before they put them in their tank water as that is one less water param change that the shrimp have to deal with.
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