Try Charleston Lighting. Here's a link:

Here is a link that might be useful: Lanterns from Charleston Lighting

I am an interior designer. These look like some great ones from North Eastern Lantern in NH under the 'CONCORD COLLECTION'. They come in variety of finishes. The patina of a copper would match in time

I think that style is close to the one on the bottom of the Concord page.

We offer buying services for most trade only items. If you know what you want in advance it can save you a lot.

Found a web site with hand made copper lighting with various finish.
http://sandwichlantern.com/onionlamps.html

I think your exact lantern is pictured at periodlighting.com in the lantern gallery.