The "D" catalogs are a part of a series. With the D catalog in 1917-1919 through the D - 4 catalog coming out in 1925.
As Tom stated these catalogs and their price lists can typically be had for $25 to $100 depending on where you find them. Locally at a small gun club show or direct from an owner you can find them for the $25 figure and at larger gun shows or on eBay they will climb in price due to the larger audience and auction fever format.
IIRC, for the purist paper collectors, there are even variations within these 5 catalogs that occurred when subsequent printings added newer information or price lists were included with later dates.
Price is also affected by whether the price list is included along with the original mailing envelope from S&W.
All in all, the D catalog is probably the nicest looking with the Mountain Lion on the cover.
