Lehmans is great, and one of the things that make them that way is they are up front about when things are "imported." I believe nearly all their oil lamps are imported now. The glass ones, anyway. They are also the best resource for replacement burners, chimneys and wicks.

I had a very inexpensive Lamplighter lamp, and found an identical one at a discount store a fews weeks ago - made in China. As much as i didn't want to buy "imported," when I took it home, any quality differences were miniscule. Glass is glass, and with so few parts there's not much to mess up.