Permanently locked chest: store item request.
Lockpicking, the most tedious skill in the game. So what would be a hot delicious chocolate cookie, or a ice cold lemonade during summer? Permanently locked chest. A store item that, quite simply, is a lockpicking aide. You can set the difficulty, and then start picking away, it never unlocks!
Think about it. To quote one of my favorite games....I'd Buy That For a Dollar! (or 10...20...whatever, just gimme the box. Lol.)