Firstly, Michael Nowicki has posted several images from de Laurence's catalogs, along with an amusing story on Rosicrucians.org.
According to Nowicki, the de Laurence company was still in business in the 1960s (despite the fact that de Laurence himself died in 1936). Rather than post his story here, I'm just going to suggest that you visit the website to read his anecdote about visiting the de Laurence company.
"The Key to the Tarot: Oracles Behind the Veil, by Dr. L.W. de Laurence. It is, or should be, common knowledge that this book is AE Waite's Pictorial Key to the Tarot word for word!"
A very interesting read for those interested in the history of occult literature. Start here for several pages of scans and information: http://home.comcast.net/~vilex/Adverts.html
Website Church of Good Luck includes scans of de Laurence's catalogs. Follow the link to see several advertisements.
"Artist's Conception of de Laurence Wearing a Turban and a Tunic"
"De Laurence wrote a lot of his own material in addition to his habit of "borrowing", and what he wrote best was ad copy. He managed to fill over 500 pages in his 1931 catalog, and it stands to this day as a monument to bombast."