CHATHAM & CARON works with the following calligraphers for guest addressing on the invitation envelopes (also available for spot calligraphy). 
The scheduling and payment for calligraphy addressing should be arranged between you and the calligrapher. Please see websites below for pricing and details.
Grace Edmands Calligraphy (Charlotte, NC):
Kristen Henderson Calligraphy (Charlotte, NC):
Taryn Eklund Ink (Colorado Springs, CO):
*** A shipping fee will apply to mail the envelopes directly to your calligrapher.