https://www.mwave.com.au/product/beyerdynamic-dt-700-pro-x-c…
Normally (currently) retails for $399. Not sure if there is usually a better price for these, but this is the best I could find and I see that the last and only deal for these headphones posted here was at the start of 2022, for $299, so thought I might as well.
EDIT: It seems that at least up until recently, these headphones would go on sale for $289 at MSY and Umart, as seen here https://au.pcpartpicker.com/product/DcjBD3/beyerdynamic-dt-9….
It seems that they've stopped putting them on sale for $289 and now make them around $319 on sale. But they still could go back down to $289 later, who knows.
These are far more comfortable to wear than the older 770/990's imo. The detachable cable is also really nice for future proofing.