Printing on Metallic Envelopes

I'm using metallic envelopes for my invitations, but i'm having a hard time printing on my home computer.

does anyone know of a print shop (in manhattan would be ideal, but any place will do) where they can print on metallic envelopes?

and how does it work... do i give the printer-person a computer file with all my guests' addresses for the outer envelopes, and just their names for the inner envelopes?

i really wish my printer at home would work, but the envelope keeps jamming!