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Have you tried Aquabid? I see blue wag and blue mickymouse platties there all the time. Sometimes you can even get fry for a cheaper price. It's the 2nd place I check for anything, besides the classifieds on forums.
I got blue high fins and blue wags from a breeder on Aquabid. My most recent batch of fry are blue with orange hi-fins, mickeymouse patterns, and a couple tiger/bleeding heart stripes. All on each fish!
If you're in upstate ny you're welcome to have a few
But yes I have seen blue ones at Petcos, i have never seen blue ones at Petsmart. Although Petsmart has blue coral ones, I forget what they are called.