Randomizing nodes in a view display I've tried the solutions here:

Display random value from multi-value field in Views

And here

views... two random nodes to vote on

This is what I have:
A content type (Inventory) involving a field collection of up to 10 items with a picture, price, description and a link.

I have a block view created filtered by category (so it shows up when users click on a particular category and a sort filter setup to randomize.

The block view shows field collection items.. but I only want it to show field collection items for one node at a time, then randomize the results.

Currently it's showing more than one nodes' field collection items..  When I refresh the page, it does randomize the results, but it's mixing nodes and field collection items together.  I just want to randomize the node.
You could try the Views Field View module, which allows you to have a view as a field in another view.

So you would set up your view of nodes, filtering by taxonomy term and sorting randomly. Limit this to one result.

Then add another view that just shows the field collection items with a contextual filter for the parent entity id (I can't remember right now what filter you would use).

Then add the second view as a field on the first view.