Here's the deal. I have too many unmatched tupperware. So do you. Maybe some of them match? Bring your unmatched tupperware to my house and try to match them with someone else's. Negotiate, or just use the default: if you brought the bowl, you take the set. If there're tupperware you don't like, or you have yogurt containers (or the transparent New Seasons lookalikes) you want to get rid of, we'll happily use them here.
Saturday, August 29th, afternoon time.
Invite your friends. The more, the better chance of matching.