pls

      Block b = p.getTargetBlock(null, 5);
      if (!(b.getState() instanceof Sign)) {
        p.sendMessage(getPrefix() + "Can't fine a sign!");
        return true;
      }
      Sign s = (Sign)b.getState();
      s.setLine(0, "§8[§aBuy§8]");
      s.setLine(1, args[0]);
      s.setLine(2, "$" + price + "/ea");
      s.update();
      return true;
    }
    return false;
  }
}