(Strip Number 4430, Original Publication Date, 21 May 1984)
Panel 1: Having noticed that there's a bunch of grey stuff displayed on tables in front of the Pattermanse, Gordon asks Mike what's happening. Mike tells him that his mom's having a yard sale.
Panel 2: He then tells Gordo that the people she works with have brought all their grey stuff over to the Pattermanse.
Panel 3: When Gordon asks when they're going to start selling all of this grey stuff, Mike says that he doesn't know.
Panel 4: As he watches Elly about to pay Monique for some grey stuff, Mike tells Gord that they're still buying junk from each other.
Summary: While this is typical yard sale behaviour, I think that it's somewhat telling that the Coloring Wizard was told to colour everything being sold grey. It tells us that we're not supposed to think that the grey stuff is worth keeping....just like all of Ruth's 'grey' stuff.