Need some help to import a part.

Hi buddies

I live in France and I need some help to import a part.
It's not an automobile part, but a firearm part.
Don't worry, of course, it's not a classified part : just a rear sight for a black powder Remington Rolling-block rifle.
I located this part for sale in USA but the saler (S&S firearms, Glendale, NY) doesn't ship internationally.

What do I need?
Somebody who could buy this part for me and send it to me in France in a padded envelop.
Of course, money for purchase, domestic & intl shipping will be transfered in advance by PayPal.
I'll pay $20.00 for this favor.

Francois