I could have missed this price drop, but Warehouse Stationery along with The Warehouse, Noel Leeming, The Market, Heathcotes and maybe others, have dropped their Chromecast with TV remote down to $69.
Warehouse Stationery have an online promotion at the moment where you get $5 off for every $50 spent, bringing it down to $64. This is applied automatically in the cart.
Heathcotes appear to have it priced at $67 so you may be able price beat somewhere if it's worth a few extra bucks to you, but I imagine you'd have to do this in-store.
Please note it is not the 4k version.