I recently found the same plant, erroneously labeled as
Opuntia monacantha 'Joseph's Coat' at a local Home Depot the other day. It seems like Altman released a few of these recently.

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I'm starting to lean towards
Consolea falcata for the ID because the elongated shape of the pads is a characteristic of Consolea. Also, there was a larger one for sale labeled
C. falcata. What else could it be if it doesn't look like
C. rubescens and is from a Big Box Store?
Here's "O. argentiniana" from another nursery. It doesn't look like the plant in question, and the pads are flimsier.

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