Thanks, Jayne. The person who wanted those--Athene's breeder--also talked to Lauren, with the same response. Apparently, Athene's breeder didn't think the Stack 'N Go standards were all that similar to the ones in the article. Same concept, but different style. It was the style she liked, so she's still looking for the ones in the article.
She said they are probably from Europe, for what that's worth. Maybe one of the European members of ES will reply.