I bought myself a MK809II, a Chinese TV stick running Android that connects to the HDMI port of your dumb TV and transforms it in a smart TV. It’s pretty inexpensive, going for about 50 euros and pretty power efficient:
at 5V-1.5A = 7.5W maximum load * 24h = 180W/h max per day, at 0.15€ average KW/h results in a total of 0.027€ per day (around 10€/year in electric bill) if one was to use it day and night….
The specs are okay, with the RK3066 chip, dual core A9 cortex 1.6Ghz CPU and Quad core Mali 400Mhz GPU, 1GB DDR 3 RAM, 8GB internal memory (SD card expandable), WiFi b/g/n and Bluetooth 2.1. Talking about incredible bang for the buck… but as always the main question is, does it deliver?