Over at The Sizzle, I am selling Orange Pi Zero boxes with the excellent Pi-Hole ad blocker installed and pre-configured. The deal link has heaps of info about it if you're interested in a network wide ad-blocker (as opposed to just browser-based blocking).
They're $59 a pop including delivery and as a special for Ozbargainers, I am including a free 3-month subscription to The Sizzle newsletter. No code required - if the email address you enter in the PayPal form isn't already a subscriber of The Sizzle, you'll get a 3 month non-recurring subscription for free (i.e: you won't be charged extra after 3 months and you can unsubscribe at any time).
The subscription starts immediately and will last until 3 months after the Pi-Hole units ship out.