I wouldn't recommend a used Le Nez kit, unless you just want it for fun or something; Le Nez kits are notoriously finicky, and lose their 'strength.' For instance, Q-Grader instructors are replacing Le Nez kits every 2 years or so because they're less useful over time.
So unless someone has one that they just got recently and realized they don't need, the idea of a "used Le Nez du Cafe" kit is a little like buying "old coffee beans." Might be good for gluing to construction paper for folk art project, but not really much else.
Just trying to be helpful!