On special again at Coles, equivalent to $12.50/kg, which makes them a little cheaper than the Woolworths special which is currently running:
https://www.ozbargain.com.au/node/670336
Coles only have the salted variety though, if you want unsalted then the Woolies offer is best for you.
Comparing the cashews from both stores, I find the Coles cashews to be better cleaned, the Woolies ones often have traces of husk still attached.
Thanks to Pricehipster.com.au for alerting me to the price drop on Friday, and today I found them on-shelf at the same price as the online price, with the usual yellow price tag indicating a special price.
Be careful not to accidentally pick up bags of mixed peanuts and cashews, which are right beside the cashews, and often get mixed in with the cashews. The mixed peanuts and cashews are also on special, for $8 per 800g.
Allergen warning: definitely contains nuts. Also says other things like sesame and peanuts "may be present".
Edit Wednesday 22/10: New catalogue is out, and cashews are still at the same price (online at least, haven't checked in-store). Unknown how long this deal will last for!
Thanks for the allergen warning, didn’t realise these contained nuts.