Noticed Amazon AU had the same price as some Big W/Coles specials, but there was also a 15% off promo going on to combine with Amazon free shipping on $49 spend (or prime with any spend).
The 15% off applies to any of the ~2600 items in the main link, as long as your total cart is $50 or more. You can also select the discount tabs on the left hand side of the main link to show only the discounted items: 10% Off or More, 25% Off or More, 50% Off or More, 70% Off or More
Some picks I noticed, prices are before the 15% discount for $50 spend:
BabyLove Cosifit Newborn Nappies Up to 5kg (30 pack x 4) 120pk $19.96 ($0.166/Nappy before disc, $0.141/Nappy after disc)
Huggies Ultimate Newborn 108pk $24 ($0.22/Nappy before disc, $0.188/Nappy after disc) - Matching Big W Special
Pine O Cleen 1.25L$5$2.50 - Matching Coles 1/2 Price Special
Colgate Total Advanced 190g$6.99$3.50 - Matching Woolworths 1/2 Price Special
Colgate Plax 1L Mouthwash$9.99$4.49 - Matching/$0.50 less than Chemist Warehouse 1.2 Price Special
Cold Power Regular Laundry Liquid/Powder 2L/2KG$16.99$7.90 - Matching Coles 1/2 Price Special
Dynamo Professional Stain Removal Laundry Liquid 1.8L$17.99$8.75 - Was this price (1/2 price) at Coles last catalogue.
NIVEA Raspberry Rose Lip Butter, 16.7g$4.99$1.20 - Currently $2.49 (half price) at Big W
Cetaphil Moisturising Lotion 500ml $11.55 & Some Oral-B Items same price as the Priceline deal
50% off selected Swisse Vitamins
50-75% off selected Blackmore Vitamins
All 50% off + Items (200 Items)
Terms
These terms and conditions apply to the offer (“Offer”) whereby customers who purchase $50 or more on selected household and personal care, baby and body care supplies will receive 15% off their order. Offer is valid until 11:59pm (AEST) on 30th September 2018. The Offer will only apply to items sold by Amazon AU on Amazon.com.au. Offers do not apply to purchases made from third-party sellers on Amazon.com.au even if “fulfilled by Amazon”. Each Offer is valid only for select household and personal care, baby and body care products as displayed for that Offer on amazon.com.au (“Qualifying Items”). The Offer only applies to a purchase of $50 or more of Qualifying Items in a single order. If you do not add $50 or more of Qualifying Items to your Shopping Cart, the Offer will not apply. If you cancel or return part or all of your order such that your order no longer contains $50 or more of Qualifying Items, the Offer will cease to apply and, if applicable, you may be charged for any items retained that no longer meet the relevant Offer terms. Offers cannot be used on pre-existing orders. This Offer is subject to availability and may be withdrawn or amended without notice. This Offer is not redeemable for cash. This Offer is non-transferable and may not be resold. Amazon.com.au’s Conditions of Use and Sale apply. Delivery will be applied to each item in accordance with Amazon AU's standard delivery rates and policies. If eligible for the Offer, the discount of 15% off Qualifying Items only (for each order containing Qualifying Items totaling $50 or more) will be applied at checkout. A limit of 5 identical Qualifying Items per order applies.
And don't forget Cashrewards 6% cash back for purchases on Amazon.