"Regardless, I would gladly pay twice as much for the device if it came already set up. I am very pro-hobbyist, but in this case I want a fully formed product."

So something as simple as a Raspberry Pi B+ ($25), an OmniVESA (approx $7), a USB WiFi dongle (approx $9), a 4GB MicroSDHC card (approx $6), a micro USB charger (approx $4) and a short HDMI cable (approx $7). Total cost $58. Could add a cheap case if you wanted. Perhaps there are ways to do all this cheaper with an Android mini PC, but a RasPi setup would be very flexible, and wouldn't require too much setup. It's also easy to boot straight into a web browser (can find some distro recommendations here https://www.raspberrypi.org/forums/viewtopic.php?f=71&t=8502...).

http://www.mcmelectronics.com/product/RASPBERRY-PI-83-16317-...

http://shop.pimoroni.com/products/omnivesa

http://www.amazon.com/Raspberry-Pi-WIFI-Adapter-Dongle/dp/B0...

http://www.amazon.com/Sandisk-MicroSDHC-Memory-Adapter-Packa...

http://www.amazon.com/BlackBerry-Folding-Blade-Micro-USB-Cha...

http://www.amazon.com/Your-Cable-Store-Foot-Plated/dp/B00474...

Even though you're ideally looking for an off the shelf solution, hope these suggestions are of some use.