Teacher Sells Ad Space on Exams!
This is creative! A Pocatello, Idaho, high school cut back on paper supplies for teachers. So an economics teacher approached a local pizzeria with a proposal: Buy me paper, and I'll put advertisements for your establishment on the handouts, worksheets, and tests that I print on your paper. See more details here.
I think I could work out something about product placement in word problems. Kinda like, "Would Becky save more money at Wal-Mart or HEB?"
UPDATE: Seems it's been done before.