Turning Archive 2004
Dont know about set levels in US prices. However, I think your linear pricing structure will lose you money. The way I read it you will scale your prices by inch of diameter. So say a 4 blank cost $8 an 8 blank would cost $16. But if you think about the area, it has not just doubled it has quadrupled (pi x r^2). Thus the 8 blank should cost $32.
Looking at the suppliers I buy blanks from this is exactly how they price it. Linear in thickness (ie a 2 blank is twice the price of a 1 blank the same diameter) And the price scales by a square law in the diameter direction. E.g. some prices taken from a suppliers catalogue.
Ash 5 diameter x 3 £2.73 (UK pounds)
Ash 10 diameter x 3 £10.92 (UK pounds) (If you divide by 4 you get 2.73)
Hope this helps