You could, I suppose, take the bus that runs from Beauvais airport to Port Maillot and costs about half of what you quoted. Then you could walk to the Maillot Metro subway stop, ride 11 stops to Chatelet, and catch the RER to CdG. For details:
http://www.ratp.fr/en/ratp/c_21879/visiting-paris/
http://www.aeroportbeauvais.com/index.php?lang=eng
I assume you want a connection between one of the budget airlines that thinks Beauvais is Paris and a line that actually lands at Paris. This roundabout route does not sound like a bargain and will be costly in time and stress. How does the cost compare to simply flying into CdG to make your connection, with the airlines handling your baggage transfer and a minimum amount of formal paperwork and security?
If, instead, you intend to meet someone landing at CdG and staying in Paris, it will be easier if less sociable to meet at your hotel destination.