It depends on which Chanel Boutique and the SA.
I usually receive free shipping if I get from one particular SA. But, I do tend to buy from her and refer to her a good bit. So, I think she does it for those reasons.
Other boutiques have charged me $25 for regular shipping and $35 for overnight shipping.
Honestly, for the amount we're spending, you would think they could throw that in for free.