Antigod wrote:
..isn't there a belt or a back piece that dispenses pebbles..
Yes,
Pellet Belt.
I skilled up leathercraft for a while making these, and they sold quite well. Each use gives you a stack of 12 pebbles.
As you can get 24 stacks of pebbles from each one, they are a reasonably economical and effective source of pebbles. They do have a 1 hour timer though, so this will take a while.
I got through 4 or 5 of these belts while skilling up throwing as a whm (mainly to have capped throwing while levelling my nin sub). If you do this, then you really need more than one, so you can get a decent number of pebbles each session without having problems with the 1 hour timer.