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They can be... I found some at one pet store for like $10 and I said no way! But I looked in the feeder fish tank in my lfs and saw that they had some in there for 29¢! They may not be fully pure but they still look amazing!
I got mine at petland. I haven't seen any at petsmart, but I did find that they had some hybrids that were called Cobra Endlers Guppy. But there is always a chance! Check out the classifieds here, aquabid, and even eBay. Just check the reviews that the people have had with the fish!