I am shipping my items through U.S. mail and have added this in my
shipping configuration. There is no default way to add insurance to the
total cost. I would like this to be a user option. The U.S. Postal Service
said that this would have to be worked out through the cart provider
(Miva) and was not something they could do. Does anyone know how
to add insurance as an option? Maybe a third party add on like UI or am
I overlooking something?

Thank you!