We would like to know the simplest way from CDG to Gare St. Lazare, other than a taxi. Someone said that we could get a shuttle from CDG there, but I have seen some rather involved directions. Help.
Take the RER B to Gare du Nord. Walk through the connecting tunnels to the Magenta RER station. Take the RER E to Haussmann--Saint-Lazare. The fare is €8.50. Keep your ticket. You'll need to insert it in the turnstile at Hausmann--Saint-Lazare to exit the system. Walk to Gare Saint-Lazare.
For a zoomable map of the RER & Metro system, go here.
For detailed instructions, including photos, on taking the RER B from CDG to Paris, go to the Paris by Train site.