Here are some weird, mostly useless items for your students to sell. You can give them 3-4 minutes to get ready for the game. This is suitable for any level but it may be even more funny on b1-b2 levels.
I'm Sercan, from Turkey. I was born in 1991. I graduated from public administration department and i'm a masters degree student at the moment. I'm studying on political science and international relations. Also i'm trying to teach English. I know that i'm not the best one but i try to improve myself everyday.