Does anyone have a lead on a link to a chart that would be able to tell me how many boxes of 4" cigarillo's or chocolate sticks I would need for certain size cakes?

Hi -

Squire's Kitchen (England) sells these and this is on their website:
http://www.squires-shop.com/ibf/index.php?p=product&id=581&parent=0

Guide to Quantity
An approximate guide to how many SK Chocolate Cigarillos youll need to go around the cake sides.

6" round = 64 6" square = 79
8" round = 85 8" square = 103
10" round = 104 10" square = 131
12" round = 125 12"square = 155

HTH.