If you are looking for bone chips, place a bone chip on the vendor before his inventory fills up (or kill him then place a bone chip).
If you are lucky, and chosen your vendor well, next time you come back it might be full of bone chips!
If you really want you can fill the vendor's 'visible' slots with cheap crap and hide your bone chip so it will be lees likely for someone else to take them
bone chips are used for the sake of example.
|