Amazon offers its Prime members the Panasonic Touchpen, model no. TY-TP10U, for $24.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $5.74.) That's the lowest total price we could find by $35. This device turns your Panasonic 2013 ZT60, ST60, or VT60 Plasma TV into a virtual whiteboard.