Paintings of the numbers 1 - 1000 are up for sale. Painting one costs $1, painting 234 costs $234 and so on.

This is the pricing method:
Value = 1000 - number.
Initial discount: 90%.
Current discount: 70%.
The discount will decrease by an absolute 10% for every 100 paintings sold.
Min. price: $40.

+ you will note that 607 is taken.