Here's the waveshare board that a lot of people are using for $22 AUD
Here's an XBee Pro for $43 AUD with the antenna already installed.
They're available from DigiKey Australia too. These are the exact Xbee and daughter card I have.
Here's the Pro model. You might only need one with this because the power output is strong, but that depends on the layout of your home and where your devices are.
This is a far better value than importing IKEA repeaters. A lot more powerful and you'll be able to map your Zigbee network.
Here are the settings for Windows
Here are the settings for Mac
You just download XCTU, put in the values, press program and it's ready to go.
LInks for downloading and instructions are in the first post. You'll actually feel kind of silly for worrying about the process so much when you finally do it yourself. Writing your first RM rule is seriously more complicated than this.