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Live prices
Looking for the most affordable whey protein isolate options at ASN? This page shows WPI products available at ASN sorted by price, current as of May 2026 and refreshed regularly. Right now, Switch Nutrition's Beef Protein Isolate starts from $19.95, while Muscle Nation's Protein 100% Whey Isolate comes in at $34.95. When comparing different sized tubs, always check the cost per gram of protein rather than just the sticker price, since a larger container at a higher upfront cost often works out cheaper per serve. The products below include both whey isolates and alternative protein isolates, so check the ingredients if you specifically need whey. Prices can shift between sales cycles, so if you're not in a rush, it's worth checking back or setting a price alert for your preferred brand.
Check the price per 100g of actual protein, not just per kilo of powder - a cheaper tub with less protein per serve often costs you more.
How the live ProteinPrice Value Score is calculated
This isn't actually WPI - it's beef protein isolate, which ranks 1st on this list but feels like a category mismatch. At $19.95 for just 120g, it's a tiny sample size rather than a proper tub. The 3.17 cents per gram of protein cost looks competitive on paper, but you're getting minimal product. Chocolate sea salt is an interesting flavour choice for beef protein. Only available at ASN, so limited if you shop elsewhere.
Amazonia Raw Protein Isolate ranks 3rd on this list at $47 for 500g. The value score of 7.2 out of 10 reflects decent pricing for a plant-based option. At 11.4 cents per gram of protein, it sits in the mid-range. The smaller 500g tub means you'll restock more often than bulk buyers, but it's a reasonable entry point if you're testing plant proteins or prefer vanilla flavour.
Rule 1's R1 WPI ranks 4th on this list at $11.44 per 100g. It's a small 454g tub, so you'll be reordering frequently if this becomes your daily driver. The value score of 5.6 out of 10 sits in middle-of-the-pack territory. Not the cheapest option here, but Rule 1 has decent brand recognition among Aussie lifters who prefer established names.
Body Science Shred Protein ranks 5th on this list at $6.87 per 100g. It's a mid-range option that balances cost with quality, though the 800g tub is smaller than some competitors offering kilogram packs. The value score of 7.6 out of 10 reflects decent bang for buck without being the absolute cheapest. Available at ASN, it's accessible for Aussies shopping at this retailer. Not the top bargain, but a solid choice if you prefer Body Science's formulation.
