I must warn, though, that these cheaper items are often unbranded. What's more, although both cables mentioned above are probably made in China, sometimes the branded ones are better quality.
Conversely with some goods, branding just doesn't matter. If, like me, you need a new Toshiba-compatible laptop battery you might be willing to go generic to save $100 or more. A generic m800 laptop battery costs just over $53, including postage, on Trade Me from ray_tech. The equivalent battery direct from Toshiba is A$199 ($250).
I asked food and garden writer Virgil Evetts for his favourite categories. Evetts puts together $20 projects each month for a gardening magazine and sources much of the equipment needed on Trade Me. A recent project needed an aquarium heater, which might cost $30 at a pet shop. Trader petstoreonline sold one for $12.
The other warning is that it is much easier to return an item to a store than it is to send back to a faceless Trade Me seller. Not all smaller sellers follow the letter of the law when it comes to returns. What's more, the Consumer Guarantees Act doesn't protect you if you've bought an item by auction rather than using the Buy Now price.
Some of the "new" items on Trade Me are unusual. You can even buy live goldfish very cheaply from sellers like addicted2fish and ls813.
They'll even have them couriered to you in a container of water.
Another slightly unusual, but super-cheap "new" item you can have couriered to you by a Trade Me seller is live crayfish at $69.90 a kilogram from trader hbseafoods.
If it's garden plants you're after there are some real bargains on Trade Me.
Many of the traders are growers, so you cut out the middleman.
More deals
Molokai paddle board package. 10ft 6". $499.99 down from $799.99.
Half carat of diamonds set 9ct gold diamond pear-shaped ring $399.99, save $1100.
25 per cent off the L'Oreal Paris cosmetics range. Farmers branches.