We purchased it at an industrial warehouse supply house that we sourced on line. I do not remember the name but if you have trouble finding one you are welcome to call our office and we can look a bit deeper. thanks for your comment!

This might be a good start as a potential source. A photo is here.

IKEA?

No, Follow this link to http://www.afastores.com/sunny-designs-santa-fe-library-ladder.html