Edit: price has increased to US$63.66 (=AU$86.60), so while that's a little bit cheaper than RS components ($93.60) and Element14 ($92.40), I'm marking the deal as expired.
Cheapest ever price for RPi 4 with 4GB RAM!
15% off with coupon code, details here: https://www.ozbargain.com.au/node/561848
US$67.40 less 15% = US$57.29
Also stacks with additional 3.5% back from CashRewards, so even lower in price.
You can also get a free storage bag (not suitable to store RPi in), see here for details: https://www.fasttech.com/forums/promotions/t/3096184/coming-...
Note: the store is Fasttech, not TechFast. Fasttech is a Chinese online seller, delivery expected to take 3+ weeks unless you pay for a shipping upgrade.
Note also for business purchasers, Fasttech do not add GST to the price, so you can't claim GST back.
From the webpage:
Raspberry Pi 4 Model B Quad-Core 64 Bit Motherboard Mainboard Broadcom BCM2711 CPU / 4GB RAM / Bluetooth V5.0 / 802.11ac / 2.4GHz/5GHz dual band / supports 4K