Just received a camelcamelcamel notification that this has dropped to it's lowest price ever at $49. It looks like Amazon are matching JB Hi-Fi, so if you prefer to purchase from an Australian store here is the link. (note that click and collect is free, but delivery will cost you).
I have one of these in the garage. It is easy to setup, just plug it into a power outlet and download the Kasa Smart app, available on both iOS and Android.
I find notifications for movement/noise are instant, but it does take a few seconds to open the app and view the live stream. It also works great with your Amazon Echo Show if you have one.
There is an unbiased review on AV Forums available here
Features as listed on Amazon:
1080p HD
Works with Echo Show/Spot and Google Chromecast/Google Home Hub
Compatible with IFTTT
No hub required
Night vision up to 6 m
2-way audio
Edit: As noted below by ozblogger you can get an extra 5% off if you have a code from this deal (please note deal is targeted). Also thanks to relentlessM8 for testing.
Edit 2: jaydee4 has noted that TP-Link are releasing a subscription plan, so it will be worth reading this information from TP-Link before purchasing.
Possible extra 5%off with jb coupon code
https://www.ozbargain.com.au/node/561418