What is the 3x rule in reselling?
The 3x rule means pricing items at 3 times what you paid for them. At 3x, you can absorb a 15% platform fee, a few dollars of shipping, and still make a reasonable profit. It's a useful floor — but for rare or high-demand items, you'll often price well above 3x based on comps.
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Key things to know for Australian sellers
Australian online selling has its own quirks: GST registration thresholds, Australia Post rate structures, and platform-specific buyer behaviour differ from the US and UK advice you'll find most readily online. Checking ATO guidance directly and using the Australia Post postage calculator for accurate quotes are good starting points.
Using multiple platforms together
Most successful Australian resellers end up selling across at least two platforms. The marginal effort to list on a second platform is much lower if you already have photos and a description, and reaching two different buyer pools meaningfully increases your chances of a sale.
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List once, sell everywhere
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