The Good guys have lost their mind… Checked the site just now and they have reduced the price of the RBK50 ORBI to $399, AND the 25% off voucher is still valid! $399 - $99.72 (25%) = $299.25 …
I know back in the day this used to be cheaper, as it's a retired set the prices have been higher. This is the cheapest I have seen it around.