eBay with 1SaleADAy has the Mattel Mindflex Duel Game for $35 with free shipping. Normally $49+. Battle a friend of yours using mind-eye concentration that uses brainwaves to levitate a foam ball through an obstacle course. Amazon also has it for the same price.
If I'm going to have a mind duel, it's going to end like the scene at the beginning of Scanners