Best Place for MacBook Air Configure to Order Models?

Hi there,

I'm currently looking to buy a Macbook Air 2018 with upgraded 16GB RAM. Haven't found any good deals on CTO models and JB-Hifi sales wasn't able to offer me a discount.

Could you please suggest where can I get the cheapest CTO model? Or should I really hold off until EOFY sales?

Thanks in advance :)