Honestly, I watch ebay, and have purchased two lapdocks both under $40, I then bought a Y otg female to 2 male otg usb cord, cut the red (&black wire) on one arm that goes to the Pi Zero's USB, and the untouched one goes to the power. Then with 2 hdmi adapters connect the HDMI. It need a Micro female HDMI to male standard then female standard to mini male. Now I can connect any Pi, but really set up for a Zero. The Zero will power from the Lapdock easy, but Pi2 or 3 requires a better power source. NOOBs will turn the screen off after boot, but a normal Jessie, or wheezy OS works good. This will also add speakers and 2+ USB ports depending on the lapdock you purchased. Mine are model Lapdock 100, others are more pricey. I wouldn't pay more then $50 for one with power source, since if you just watch ebay long enough some do as low as $25-$35 and some with a power source for it.
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