Fast forward to 2026 and Amazon is now the biggest online retailer in Australia, helped by its ultra-fast shipping (including same-day delivery), wide product selection and, of course, very competitive prices. Having shopped at Amazon for years, we’ve often found it to have the best prices for specific brands and product categories, especially during major sale events like Prime Day , EOFY , Black Friday and the currently underway Prime Big Deal Days sale. Our close monitoring of deals means there are certain brands and products we’ve learned you should never buy at full price, due to how often they show up discounted during major sale events on Amazon. Top brands you shouldn’t pay full price for Ninja (Image credit: Future / Ninja) Despite running its own deals and discounts on its website, it's undeniable that the best prices on Ninja air fryers, coffee machines and other appliances are usually found on Amazon, particularly during major sale events. 05 Shark Much like its sibling brand Ninja, Shark ’s range of vacuums, hair stylers, air purifiers and more are also available on Amazon, frequently with generous discounts, too.