Were can i find the price of antiquated bricks?

Were can i find the price of antiquated bricks?
I have a extent that I use when i trade bricks...after 10years old add on 1 cent for every year that the brick has aged. Actually I dont use that extent but if i was a mason or something close to that I would think that this would be the size I would use. Hopefully you have a ton of bricks!
collectors.
contained by the newspaper or most predictable online ebay to be specific