I haven't bought any Lobster Bisque from Red Lobster in about a year but yes Red Lobster does make and serve Lobster Bisque.
The Red Lobster Lobster Bisque is very delicious and even better than the Lobster Bisque I could ever make at home so I'm not sure how they make their Lobster Bisque so good.
The cost of a bowl of Red Lobster Lobster Bisque is $6.79 when I bought it but the cost can vary from location to location.
In one location the Red Lobster Bisque may be a bit more expensive than other places.
But it should be no more than $7.00 or $8.00 depending on the serving size of the Red Lobster Bisque.