What are the optimum shipping quantities for Firesafe™ Cannula Valves (i.e. we have fixed prices from shipping agents based upon weight and dimensions)?

Shipping weights and dimensions are as follows:

100 Firesafe™ Cannula Valves:

Mode of Supply: 5 bags of 20 in a box

Dimensions:  18.6 cm x 12 cm x 4 cm

Gross weight: 0.5 kg

3000 Firesafe™ Cannula Valves:

30 of the above boxes in a large carton

Dimensions: 62 cm x 15 cm x 47 cm

Gross weight: 15.5 kg