Torque Boxes?

NUMB3RS. Quantities of anything produced reflects in the pricing.
You could set up and produce 10 or 10,000 sets if torque boxes and see a huge difference in the per unit production costs. The issue is how many sales and how long it takes to recover that initial cost.
There is some info on the web about making torque boxes if you wish to make a set .
I dont have the link handy but I've seen it before. Good luck