Seems like a decent deal. Sub 900 isn't the lowest RTX 5070, but is fairly decent IMO. No afterpay required or ebay plus, just 10% off flat with code.
Credit to https://www.ozbargain.com.au/node/920379 for the coupon. (RX 9070 non xt is about 3-7% faster on average per techpowerup, with a 16GB VRAM buffer), however this 5070 is about ~9% cheaper. Depends what you're after! The AMD card is also larger.
*Eligibility. This offer is available to all eBay customers, but this item cannot be delivered to addresses in Northern Territory or WA Remote.
Probably rather pay the extra for 16gb to be honest.