I bought mine off JB HIFI Business for $348, but you can also get them off DJI.com as well
Currently, they're going for $529 @ digiDirect. They're a bargain at this price tbh.
For those umming and erring you can get them refurbished for $309 @ DJI's official website - here
Or the DJI Mic 2 (1 TX + 1 RX) without the case for $207 here
DJI Mic Mini is also on special for $219 on JB HIFI Business from memory?
Sorry for the DJI bargain flood
My favourite mic