Amazon offers the Tianle Android Streaming Media Stick, model no. TL869 for $17.89 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise it adds $6.35.) That's the lowest total price we could find by $15. It plugs into your TV via an HDMI port and allows you to stream movies, games, and apps from Google Play.

Update: The price has increased slightly to $17.99.