shuttle service from CDG airport to Gare St Lazare train station

How many people? There is a fixed price of 50 EUR to the Right Bank, and Gare St Lazare is on the Right Bank.

Young able bodied Solo traveling with no money? Take the RER B; it only costs 10 euros more or less.
Tech savy ? see here https://www.ratp.fr/

Take a cab or take the train; Paris is not a shuttle culture and shuttles are known to be unreliable. If you do book a shuttle don't pre-pay.

Roissybus to Rue Scribe for 12.50€ per person followed by a 10 minute walk is my suggestion: http://www.parisaeroport.fr/en/passengers/access/paris-charles-de-gaulle/public-transport/roissybus. Now you have the three main ways to get from CDG to the station -- choose wisely.

I second the recommendation for the Roissybus. I have taken it several times on my way to or from Normandy, and find it a very pleasant, sightseeing way to get in and out of the city.

"It is an ugly ride getting in and out of the city"

It is an ugly ride getting in and out of most cities. Close your eyes and think of England.

Close your eyes and think of England.

Norma, that has a familiar ring. Where is that quote from?

Sam, are you kidding with that question?

Sam, it was either Queen Victoria or a member of the British aristocracy who is supposed to have said that to her daughter, who was getting married and was distressed about what was to take place on her wedding night. No matter, I always find it funny.

I googled it. I was thinking it might have been a movie reference, like "Frankly my dear, I don't give a damn." But it just seems be an apocryphal quote, mis-attributed to Queen Victoria. Wouldn't seem to jibe with character being portrayed on the current BBC/PBS series.

But, Sam, whatever its origin, you have to admit it is funny.

To Barbra’s point that a shuttle is not a very pleasant sightseeing way to enter Paris ... this is true but not all sight seeing needs to be be pretty and pleasant. It is interesting and good to be reminded that though Paris is a glamourous destination for us as tourists, many, many Parisians live deprived existances in ugly high rises on the outskirts. The same can be said for my city and likely any large city in.North America.

All routes into Paris from CDG are not scenic or especially pleasant. Whether you are in a taxi or a bus or the RER, when you look out of the window you see the same things.

The "think of England" part of the quote above is indeed from a movie, " Waterloo" (1970). when the young English aristo Lord Hay in his first battle is exhorting his men in the British square as they are under heavy and sustained attack by waves of French cavalry.

He says repeatedly, "Think of England." until a bullet catches him.

Fred "Close your eyes and think of England" is definitely older than 1970. And "Think of England" on its own is a different quote with a different meaning.
It is definitely not a positive reference to English countryside. But, as Norma says, a negative reference to the (possibly untrue) lack of knowledge of sexuality by Victorian brides.
This website claims a version appeared in print in 1912: https://www.phrases.org.uk/meanings/close-your-eyes-and-think-of-england.html
but, given the generally unprintable nature of the meaning (at least in those times), it was probably a known phrase before then.

I was quoting the scene from the movie, as I described that movie scene, see the movie "Waterloo" You'll know specifically I am referring to when the young Lord Hay says over and over, "Think of England." as his square is being gradually shot to pieces.