Here's a topical slideshow from the National Retail Federation that would be great for using in class.
Print out hard copies of the four most interesting slides (in colour if possible) and put your students into groups of four. Get each student to prepare and deliver a mini presentation of the their slide for the others in the group. You could also get selected students to come to the front of the class and present their slide to the whole class using the videoprojector.
• Halloween infographic (The Shelf)