How much do you charge to put chocolate cigarellos all around a cake?
Since no one has answered, I would suggest that you take the price of the cigarello's and double or triple that - plus charge what you would normally charge for each slice of cake.
For example, say you charge $50 for an 8 inch. And pretend the cigarello's are $5. I would charge $10 or $15 for the cigarello's. Bringing the cost of the cake to $60 or $65.
I have no idea how much it would cost - because I don't know if this is a single tier cake or a 4 tiers. But cigarello's are pretty expensive.