Walmart seems to be the common place to get them, they aren't anything special, except the TSA guys can open them. I talked with an agent for a bit about them, wondered if they were all keyed the same, meaning could another Joe Shmo with TSA locks/keys open mine, he said no. All keyed differently, but there are several different master keys that the TSA guys have that open them all. One point they did all agree on, regular luggage, ie suitcases, duffles, etc., that you want to lock, must be a TSA lock, regardless.
