That is the tool I referred to before when I said the LBS may or may not have one. Once you get that locknut/cone off once and put a little grease or anti-seize to it you should not have such a problem. But if you want to pop the $20 go ahead. Remember to still pop the crank in a vise. BTW we never determined why you are removing it - is the cone worn or the chainring being replaced?