Cheapest price I've seen, and the EFTPOS Card makes it even better.
EFTPOS card details here thanks to user Asur for posting.
These came out with an RRP of $600 a little while ago, AC2200 Tri Band Mesh wifi system (3 units in the box, good for a large/multi storey home), incredibly easy to setup - you just download an app on your phone and then it guides you through the setup. I've set up one system and have been very happy with it.
Not to be confused with the slower ASUS Lyra Mini system which is only AC1300 Dual Band and still more expensive.
Product Page: https://www.asus.com/au/Networking/Lyra/
Why you want this: Have you got wifi dead zones in your house? Have you got a big house that requires extenders, repeaters or multiple routers? Repeaters slow down your wifi speed by half by design, extenders and extra routers can cause problems with network communications if not set up the right way and can be complicated for the novice user, multiple routers can be setup on different network names (SSID) which isnt ideal, but allows for greater control, or on the same network name (SSID), which still doesn't allow clients to automatically connect to the closest/fastest access point, which sucks. These are easy to set up for novice users, and just work, giving you one single SSID and every device in the house automatically connecting to the closest/fastest node.
Why you may not want this: If you have a small house that one modem/router can support, then having a single decent modem router is cheaper and just as effective, or if you have a bigger house but already have Cat6 cable run through your walls as a backbone for all your devices to connect to via ethernet then mesh may not be required. However this mesh system is still very useful for all your wifi devices (phone, tablet etc) even with an ethernet backbone.