This is a pretty good price. A mate got one of these on an older ozbargain deal a while ago and I have been waiting since as it is a decent model. It is the same price for the black model found here
As you already probably know, you don't need to use afterpay.
Just select the afterpay option at checkout then apply the code and proceed to pay with eBay vouchers.
Or you can go nuts ozbargaining more coin out of the deal with
8% Cashback (Was 5%) on $20 "Swap Celebration" Gift Card Purchase (Exchangeable for eBay Gift Cards) @ ShopBack App.
Don't forget to use cashback options also utilising
Amazon AU: $5 Bonus Cashback (Min Spend $5) @ ShopBack (Activate via App) or
eBay: $3 Cash Back with $30 Minimum Spend (App Activation Required) via ShopBack.