Muliple favorites lists that can be named, ie Walmart or date, that HOLD COST entered, store name, date saved, and display profit and ROI based on CURRENT BB on favorites list page and is sortable. This way you have something you can go back to, scan down the list to see what's profitable. This list could be maintained in Google sheets so that it's accesible from AZInsights too. Also, with a button to add it to a Buy list!
To achieve this, you can create a special Buy List folder to hold these hybrid favorite items. It has most of the things you want.
FYI, we are implementing the search or sort on Buy List.
When we release new version, you can try and let us know how you feel about what we add to Buy List
Thanks for your feedback!