In the back of the magazine they list where items can be purchased. If you can't find it there, email the magazine for information. It's possible this is an older lamp and is no longer manufactured. If that is the case, you might want to post a picture here and some of the wizards of design can direct you to something similar.

I know the frustration, ironically I just finished emailing a local magazine about a lamp I saw in their last issue and I hope I can track it down.

Sky