The mod can be found
here.
I've extended maquant's original idea and released a version 2.0.
The main reason was to centralise the setting of the filter string, as I needed to use a different condition (though 2.0 release remains true to to manquant's original approach).
However, there are other improvements, notably The suppression of wholesale products to retail customers in the also purchased box and a few minor bug fixes (mainly for known problems carried over from Zen Cart core code).
One limitation at this point is that categories that are empty because there are no retail products in them, remain open, which can look unsightly. The normally recommended approach of disabling clearly won't work here, since the may need to be active for wholesale clients.
Despite these changes, credit for the existence of the mod remains with manquant. He (or she?) did the groundwork and packaged the original.
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