
The catalogue price is not your cost. To it you add customisation fees, labels, packaging, shipping, duty and inspection.
Price per piece 12, label and packaging 1.0, a setup fee of 300 over 600 pieces which is 0.5, and shipping and duty 2.5. Landed cost = 12 + 1.0 + 0.5 + 2.5 = 16.
See how the cost per piece changes with quantity: the setup fee spreads over more pieces and falls, but your locked up money grows.
Open the private label cost and pricing template and work out the landed cost of your piece at three different quantities.