100-199 Letters = $1.77/each
200-300 Letters = $1.47/each
301-400 Letters = $1.37/each
401-500 Letters = $1.27/each
501-749 Letters = $1.17/each
750+ Letters = $1.07/each

** For smaller quantities of 100-199, automated rates are not available; the per unit pricing is $1.77 and includes a first-class stamp.