Short answer: There’s no single “cheapest” site for every item — but the lowest‑priced fashion in Australia is generally found on ultra‑low‑cost marketplaces like Temu and SHEIN, with big Australian discounters (Kmart, Target, Best&Less) close behind for basic pieces and fast delivery. (apps.apple.com)

Quick details and practical notes

• Temu and SHEIN frequently list garments for just a few Australian dollars and are usually the cheapest on a price‑per‑item basis. They’re marketplace/fast‑fashion operators that keep prices extremely low. (Watch for shipping times, returns, product quality and changing import/tariff rules.) (apps.apple.com)
• Australian discounters (Kmart, Target, Best&Less) often beat mid‑market retailers on basics and have the advantage of local stores, faster delivery and easier returns — so for many shoppers they’re the best low‑cost choice. Recent viral low‑price items from Kmart show how competitive local prices are. (news.com.au)
• Comparison sites and shopping guides (e.g., Finder) list Temu, ASOS, boohoo, Kmart and Target among the top affordable options — but cheapest depends on the exact product, size, promotions, and whether you include shipping, duties or taxes. (findershopping.com.au)

What I’d recommend

• If absolute lowest price is the only criterion: compare identical items on Temu and SHEIN first (but factor in delivery times, returns and safety/ethical concerns). (apps.apple.com)
• If you want cheap plus convenience/returns: check Kmart, Target or Best&Less. (news.com.au)

If you want, I can:

• Compare prices for a specific item (e.g., “women’s white tee size M”) across 4–6 sites and show the cheapest total cost (price + shipping).