I'm looking for someplace that serves a good merguez sandwich, or that sells a decent merguez.
When I lived in Paris I dug the ubiquitous merguez frites sandwich: merguez and fries on a baguette or other bread with choice of sauce.
I'm assuming you're in the NY area (we'll put "crave" boards in the other regions as soon as we update our software)...where there's good merguez sandwiches served at the various branches of Moustache Pitza. To just buy the stuff, I'd go to Sahadi on Atlantic Ave in Brooklyn. I'm sure Kalustyan's on Lexington in Manhattan has good ones, too
I've bought decent merguez at both Les Halles and Dean and Deluca -- from the butcher, not already cooked or in sandwich form. I was rather pleased, if I remember correctly.
re: Marc Benarouche
Here are two recipes for merguez. The linked one, in English, specifies casing in the ingredient list, but the text says it is optional.
The URL for the other is: www.harissa.com/D_bouffe/lemerguez.htm
In _The Book of Jewish Food_, Claudia Roden mentions merguez, but gives no recipe. She describes them as "made of lamb or beef ground with fat and mixed with allspice, ground fennel, and coriander and plenty of garlic and harissa."