If you want to go throught the cave fighting a long the whole way you could use some, although you don't need more than a handful and should have grabbed enough on your way through the game to this point. If you're determined to get more they should be available in Baron or Mysidia (I definitely remember being able to buy them by this point in the game)
Or you can just blow through. The next dungeon offers a much better opportunity to level anyways.