We have a range of army boots but if you are specifically looking for size 12-13 in black, then you have a choice between the Magnum range and RNZAF boots.

There are different styles of Magnum boots, we have Magnums Elite 8 waterproof for $329, which are the top of the line boots. These have some great features:

* 100% waterproof & breathable Sympatex construction;

* Aerospacer mesh collar lining;

* Foot bed with dual shock pads;

* Foot Protection System: odor free, breathable, antibacterial, shock absorbing and energy returning.

These are available in either size.

The next boot from the Magnum range is the Magnum Stealth Force 8.0 Leather side zip for $219. These are full leather with a time saving side zip. These are surprisingly light, weighting similar to sand shoes.

Magnum also offer a boot with a composite safety toe for $219. These have the same design as the leather side zip boots, with cordura sides for increased breathability.

Finally, in the magnum range there is the base model. These are called the Magnum Stealth II 8.0 cordura. These are $199 a pair.

If you are looking for a cheaper option then we have RNZAF combat boots. We have both safety and non-safety versions, with the safety version having a Kevlar re-enforced toe and heat resistant soles in size 5 only and non-safety boots in size 12 only. However, non-safety version is much lighter.
Both versions are $75 a pair.

Another option in black army boots is the used UK Issue Paratrooper  Boots, these are available in  a range of sizes.
They are full leather with a paded leather tongue for comfort. They have lace fasteners to ensure a snug fit and to help prevent blisters.
They range in condition, with price reflecting this. Grade 1 boots, which are in very good condition are $75, with Grade 2 boots usually priced at $49.