Blog talk:Adnoam/Updates to Template:Item/@comment-44498734-20200821043522/@comment-25219384-20200821141724
From Fallen London Wiki
Regarding tracking items only sell-able on the Upper River Exchange:
There's no way to do this now but it would be easy to add such a category to be added automatically by the template, if it's agreed that this is useful (possibly alongside other similar categories?).