PetCo rarely knows the species of the crabs they have, except for Strawberries, because they charge more for them
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. I have never found an E at PetCo, mostly they have Ruggies, Indos, PPs, and occasionally a few Cavipes. I find Es mostly at smaller, privately-owned pet stores. What they most likely mean by "native, tropical and ?", is that they charge more for the crabs in painted shells, at this PetCo it's $3.99 for very small hermies, $4.99 for natural shelled hermies, $5.99 for painted shelled hermies, and $10.99 for Straws. Most pet stores won't know the difference between species.
You might want to call back to ask when they get their next shipment of hermies, you'll have a better choice (and the crabs won't have been in the stressful pet store for too long) if you get there within a couple days of a new shipment.