Copper is an easy place to start stacking: the entry price is low enough that changing your mind later costs you a coffee, not a week's pay. But the first product page throws three words at you at once — bar, round, tube. Here is what each one is, what it costs per ounce, and how to pick one.
All prices below are in NZD and include GST. They are our listed prices at the time of writing.
The three formats, plainly
Minted bars
A minted bar is a rectangular ingot struck from a sheet or blank, usually with a design on one face and the weight and purity on the other. Bars stack flat, sit tidily in a drawer or tin, and are easy to count.
Our entry point is the 1 troy ounce copper bar in .999 fine copper at $9.00. There is also a 5 troy ounce bar at $50.00 if you would rather hold fewer, heavier pieces.
Rounds
A round is coin-shaped but is not a coin. It has no legal tender face value and is not issued by a government mint — it is a privately struck disc of metal sold on its weight and purity. The design work is usually more detailed than on bars, which is a large part of the appeal.
The 1 troy ounce copper round in .999 fine copper is $10.00. Rounds also fit standard tubes and capsules, which matters once you own a few dozen.
Tubes and boxes
Tubes and boxes are not a different metal — they are the same rounds, sold in a set quantity and packed in the storage the format was designed for. A tube keeps rounds on their edges and lets you count stock without unwrapping anything, and it is where the per-ounce cost starts to move.
What bulk buying actually saves you
The ladder for 1oz rounds, worked out from the listed prices:
- Single round — $10.00 for one ounce, so $10.00 per ounce.
- Tube of 20 x 1oz rounds — $160.00, or $8.00 per ounce. Twenty rounds bought one at a time would be $200.00, so the tube is $40.00 less for the same metal.
- Half Monster Box, 250 x 1oz rounds — $1,800.00, or $7.20 per ounce.
- Monster Box, 500 x 1oz rounds — $3,475.00, or $6.95 per ounce.
Two things stand out. First, the biggest drop in per-ounce cost happens early, going from singles to one tube; after that the curve flattens, and each further step costs a lot more for a smaller improvement. Second, the 1oz bar at $9.00 is cheaper per ounce than a single round at $10.00, so in small quantities bars give you the most copper for the least money.
One point of honesty about bundles: The Starter Stack is five 1oz rounds for $50.00, exactly what five individual rounds cost — a tidy starting point and an easy gift, not a bulk discount. The step-up bundles (The Copper Sampler $62.00, The Kilo Club $285.00, The Foundry Box $755.00, The Grid Builder $1,118.00) each list their contents on their own product page, so check there before comparing on price.
Weight, and where you will put it
Copper is bought by the ounce like the other metals, but you get far more of it for your money, which means far more of it in your house. A troy ounce is about 31.1 grams, so 20 rounds is roughly 620 g of metal — pocketable. A Half Monster Box works out to about 7.8 kg of metal, and a full Monster Box to about 15.5 kg, before packaging. That is a two-hands lift, and it will not squeeze into a small home safe. One or two tubes is a sensible first order if you are not yet sure where the metal will live.
Copper reacts with air, moisture and the oils on your skin, so it will tone and darken over time — the metal behaving normally, not a fault. To slow it down, handle pieces by the edges or with cotton gloves, keep them in their tube or capsule, store them somewhere dry, and consider a silica gel sachet. Resist the urge to polish: it removes a thin layer of metal, leaves hairlines, and makes a piece look interfered with.
Recognisability and passing pieces on
If you ever want to pass pieces on privately, the practical advantages sit with common, plainly marked formats. A 1oz round or bar stamped with its weight and .999 purity is easy for another person to identify, weigh and compare; odd sizes and unmarked pieces leave them more to work out. Keeping the original tube or box helps too. None of this says anything about what a piece will be worth — it is about staying in formats other people already understand.
Why copper is priced with GST included
In New Zealand, the GST exemption for "fine metal" applies to investment gold, silver and platinum at set purities. Copper is not on that list, so copper bullion is sold GST-inclusive. That is the reason our prices read the way they do — every figure on this page is the full price you pay, with GST already in it. It is neither a catch nor a perk, just how the rules treat this metal. If tax treatment matters to your situation, confirm your own position with your accountant or with Inland Revenue.
Where to start, by budget
- Under $20. A single 1oz bar at $9.00 or a single 1oz round at $10.00. Buy both if you cannot decide.
- Around $50–$65. The Starter Stack (5 x 1oz rounds, $50.00), a 5oz bar ($50.00), or The Copper Sampler ($62.00) for a mix of bars and rounds.
- Around $160. A tube of 20 rounds at $8.00 per ounce — where bulk pricing starts working, and it solves storage too.
- $285 and up. The Kilo Club, The Foundry Box or The Grid Builder, depending on the size of the order.
- $1,800 and up. Half or full Monster Boxes, once you have somewhere solid and dry for 8–16 kg of metal.
A note on copper generally: it is widely reported as a core industrial metal, used in electrical wiring, motors, plumbing, grid infrastructure and electronics. That is context about how the metal is used, not a view on where its price is heading. We do not offer financial advice, and nothing here is a recommendation to buy for return.
The full range is on the copper bullion shop page. We ship NZ-wide, tracked and insured. If you are stuck between two formats, email sales@globalcopperbullion.com or ring +64 3 667 2327.