I did the same thing when I worked at the mall. Galls sells cases but only nylon. Quartermaster sells nice plain leather cases.
I would think about it long and hard. I alienated a few people by doing that, and some of the guys wouldn't joke around with me anymore because of it.
Nothing says "i don't trust you" quite like a tape recorder. If you are doing it to "catch" management wear it hidden in a pocket or on the tabs of your vest using the nylon case from Galls.
"ching ching, pull it over buddy. You're under arrest...get in the basket." ~ Super Six 5