as far as i know there is no store that sells ocarinas unless you live in saint Louis or California but online you can get one
STL Ocarina has a book for 9 holed and above ocarinas
look here, this is where i got mine http://www.stlocarina.com/ocarina-by-type-12-hole.html
If you want to get it in the game, you have to finish the first three dungeons. If you want a real one, type in 'Ocarina' in google and click on the one that goes to Groth. They an ocarina like the one in the game.
You crawl when you walk up to a hole in the wall, and 'Enter' will appear on the A button in the corner. Press it, and you are crawling.
An ocarina store. I'm not joking. I have found one free place, but it's all fan made and most of it is for the 6 and 4 hole. But try songbird ocarinas under composer and then list ( I think ) you should find something there. Also, stl ocarinas has a ton of books, and so does the previous site I mentioned.
Tr.y Songbird Ocarinas, when i bought mine that was the best website. They even have Zelda Themed ocarinas
you don't have tounlock it its just in hyrule field in the ocarina of time if that's the game you are talking about, it is accessible in a adult and child form
Malon can teach one to you after you find her dad, Zelda and Impa teach you two, Shiek teaches you six, Saria teaches you one, A gravestone teaches you one, Zelda teaches you another one, and the guy who's in the windmill teaches you the last one.
You don't have to plant the bean. You have to go to the graveyard at night, pull on that guy's grave, go down the hole, and follow that guy. He will then give you the hookshot.
If you check out the forums at theocarinanetwork.com they have some tabs. They could also point you in the right direction if they don't have what you want.
If you're talking about dodongo's cavern, you fall down a hole. In the actual fire temple, then you jump onto the rock that has some holes on the ground.
Songbird ocarinas has a nice 5-hole replica for $45 USD, and an amazing 12-hole replica with an actual band around the mouthpiece for $108 USD If you want the most accurate replica, a 7 hole (Very uncommon size) is on their site for $108 USD, and that's the best replica out there.