I had a wonderfull croque-en-bouche made for my wedding a year and a half ago , at De fromment-et-seve on beaubien street.
I had it made for 75 person and ( if my memory serves me right) around 550$. We asked for a chocolate cream instead of the crême patissière and had fresh raspberry in all the little spaces betwwen the choux. I will try to post a picture. The center of the croque en bouche a filled with other choux.
The picture did not work....sorry