Factors which can affect pricing

Color
Pricing for colors is based on where the color falls into
  White, Light, Dark or Premium categories.  
Lighter colors cost less.  
Base price applies to White garments.

Size
Oversize shirts such as 2XL or 3XL cost more.  
Base price is for sizes XL or smaller.

Quantity
Quantity discounts are given for a total order
  quantity of 12-35 pieces or 36 or more pieces.
The total order quantity consists of all the items
  on your order in any mix of styles, sizes or colors.  
Base price is calculated for an order totaling 36 or more pieces.