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Wal Mart has on clearance the Onn (Wal Mart brand) Presentation Clicker. It is basically a wireless PowerPoint remote. Many places show $ 3, though some are as low as $ 1. Not sure I would trust it in a business setting, but for that price worth a shot. Check Brickseek for availability and pricing in your area.
https://brickseek.com/walmart-inv…=57454609
Here is a link to the product at Wal Mart, but remember this deal is in store only.