I haven't tried it, but my mom called today to tell me that someone just gave her a big box of peppermint bark from Long Grove Confectionery. They have it in both dark and milk chocolate. Mom loved it.
It's in their catalog, but I'd imagine it would be at one of their locations (though the BG store is a factory outlet, so prices are lower, but they don't have the gift boxes and such):
LONG GROVE, IL
220 Robert Parker Coffin Rd.
Long Grove, IL 60047
847.634.0080
Store Hours: Mon - Sat - 9:30 - 5:00 and Sun - 10:00 - 5:00
BUFFALO GROVE, IL
Factory Store
333 Lexington Dr.
Buffalo Grove, IL 60089
847.459.0269
Store Hours: Mon - Sat - 9:30 - 5:00 and Sun 11:00 - 4:00