A while ago I saw a gorgeous red and black butterfly delta tail at Petco. Alas, both my tanks were full. I wanted to divide my 5.5 gallon to make room for him, but the store didn't sell any dividers. So, I left without him. He was amazing, though. And I think he might have been a HM, too.
There was also a copper dragon plakat with red fins at Petsmart. I was tempted to get him, but I saw him the same day Petsmart had refused to give me any sort of refund for the heater that poisoned my tank and killed Severus, so I didn't buy him because that would've meant giving them more money. And I did end up getting a fish that day, just not from that store.