Not the lowest price seen on OzBargain but the lowest from Amazon according to CamelCamelCamel . The Playstation 4 version doesn't include the Mixamp.
I currently have a Sennheiser G4ME ZERO and I was looking for a replacement with good/better impedance and the Astro A40 seems like a great option. There are newer EPOS/Sennheiser cheaper than this (lower impedance), so do your research before buying.
Disclaimer: first time posting here, please let me know if I missed any info.
Edit 1: added "free delivery" in the title
Edit 2: [EXPIRED] thanks @doweyy for the catch re: Xbox one version -> A40 TR + Mixamp M80
Edit 3: Both PS4 and Xbox One (without mixamp) now at $159