There have been a few requests by B2B shop owners where the challenge is as follows:

Products should only be visible IF the observer/customer has specific prices for them. Basically, this means that no products are visible UNLESS the customer has a set price for it.

From the perspective of a former B2B procurement manager: This is a relatively common thing to see. I purchased tools for the manufacturing personnel, for example. I'd contact the potential suppliers once a year, we'd sit down, talk projected order volumes, figures and conditions.

After that was all negotiated, I'd get a price list for the various categories with individual prices, bonuses, conditions and so forth and the supplier would set it up on their end so that I could place orders online (if I wanted to) in their shop. Strictly speaking, I'd find all/most of the other items in their shop as well, but I would have preferred if I didn't - so my line of thinking aligns with the requests we got about this in Support, because I already negotiated every item which was relevant to the company I represented ahead of time - I don't need and don't want to see things I had no interest in and likely have no price list for either.

So - two birds with one stone:

1) The observer sees all the items they have a specific price for
2) The observer does not need to filter what is/was relevant to them

The implementation screams B2B Components. But I think the implementation is potentially simpler if done via Dynamic Access:

If we had a condition which checks whether or not the observer has custom prices of any sort (be it via customer group - this should be the first condition in my mind - extended prices OR customer specific prices, we'd have all the rest covered already.