I started my business almost 2 yrs ago I make liquor infused cupcakes.  I have shipped to customers in Florida, California, Missouri, TN etc.  But, I tend to lead a customer to purchase one of the follow items:

Cakepops, pushcakez, cake in a jar (shipping is too expensive for that I stopped offering it) and mini cupcakes (ONLY if they want the frosting inside and a fondant decorative topper. 

Does anyone know how one can actually ship cupcakes with frosting?

(i've tried the lolipop method)..

ARather than the heavy glass jar, perhaps you could try a clear plastic cup with a snap on lid.

i've bought the individual cupcake containers..it left alot of room on the side..so it has giggled around.. a bit.. : and sort of messed up the frosting.. wonders -- would a dry ice work for this