Special prices for quantities >500!

Catproduct config:
Update price dynamically [checked]
Use units in box [checked]
Show product sku [checked]
Show product name [checked]
Show product weight [checked]
Show product sizes [checked]
Show quantity step divisor [checked]
Show product sales price [checked]
Show product sum weight [checked]
Show product sum sales price [checked]
Show product total weight [checked]
Show product total sales price [checked]
Show product total tax amount [checked]