The primary difference between the Pro-Mix MP 'Organik' and the Pro-Mix BX is the use of a synthetic wetting agent in the BX, according to the Pro-Mix rep that I talked to years ago. There is an organic wetting agent in the MP which they consider inferior, so don't use it in most of their products.
No idea about these, I've never seen them in Walmart here. According to our store manager, their inventory is centrally managed by a regional office, who makes the decisions about what to send them and when, and all they do locally is make sure the computer inventory matches the real inventory. They don't get to choose what kind of media to sell or when they get it.
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