Ive been shopping for a used toolbox on facebook marketplace and have come up with a way to determine whether im paying too much. I started calculating the price based on cubic inches of the box and determined based on observation that a price of 6 to 8 cents is a good ballpark estimate on what these boxes go for in my area used. Obviously a harbor frieght box will not get the same price per inch as a snap on epiq. Ive been watching boxes and what they appear to sell for and this is the only way ive been able to price these things and compare apples to apples. I think im pretty close. Any thoughts on this or a better way of doing it?