Works out to $12.50 per 30 days.
You have to enter through the link in this deal or otherwise the price will be $161.82 (10% off) instead of $152.10 (15% off)
The unique Kogan Mobile voucher included as part of this product is non transferrable and cannot be redeemed for cash. Voucher expires at 11:59pm AEDT on 31/12/2019.. Activation must be made before the voucher expiry date. Voucher does not apply to subsequent recharges. Voucher cannot be used in conjunction with any other vouchers or promotional offers.
Valid for existing Kogan Mobile customers. Personal use only. Discounts available on Kogan Mobile Prepaid SMALL, MEDIUM, LARGE and EXTRA LARGE 365 day plans and LARGE and EXTRA LARGE 90 day plans, including recharges, purchased before 11:59pm AEDT 30/11/2019 unless sold out prior or extended. Discount does not apply to subsequent recharges. Not available for commercial or resale purposes. Discount cannot be used in conjunction with any other promotional offers. Not transferable and not redeemable for cash.
If you can stomach Optus Network, the Catch offer is cheaper.
https://www.ozbargain.com.au/node/427284