How do you get the Goron tunic without buying it from the shop?

In Goron City - find the lonely Goron rolling around (where the Hot Rodder Goron was as a Kid). Like you did with Hot Rodder - you're gonna have to make a Bomb explode in his path to make him stop moving - but unlike last time where you had to make him stop in the shaded area - you can stop this Goron where ever you want! However - he�s faster than the Hot Rodder and he�ll turn around and go the other way if you get too close to him. You can use your own Bombs - or the Bomb Flowers to stop him - once you stop him - talk to him - and you will notice he has the same name as you! He will explain what has happened to the Gorons - the Fire Temple - Darunia (your �brother�) - a Dragon - blah blah blah - then the guy�ll start crying - ask him the 2 questions (more talking - yadda yadda yadda) and once he answers both - he�ll give you the Goron Tunic (a red version of what you�re already wearing). It protects you from the intense heat of Death Mountain Crater - with it on - you can stay in the heat for as long as you want. Then all the doors will open and you�ll be able to go to Death Mountain Crater from Darunia�s Room - just move the Statue against the wall. Make sure you put the new stylin� tunic on before you go in - next - you�ll meet Zelda - I mean Sheik - and he�ll teach you the Bolero of Fire (good tunes) - then go beat the Fire Temple! Good Luck!

As adult link throws a bomb at the little Goron dude and ask the right questions and he will give it to you.