Items sold in bulk, with discounts

I'm selling products that are packaged in various quantities, and I want to discount these as well.

Example:

Widgets are sold in boxes of 100 pcs. for $10.00 per box.

Discounts:

2 Boxes are $9.00 per box of 100 pcs. (total 200 pcs)
4 Boxes are $8.50 per box of 100 pcs. (total 400 pcs)

etc.

What, if anything, is out there for this?

Your example could be achieved with the default quantity discounts from opencart.

Thank you, I wasn't certain.