How do I get my shield back in Zelda?

I'm currently playing Zelda ocarina of time for Nintendo.

I fought a predatory slime that took my shield and then killed me. I was then game over and pressed save as normal. Now my shield is gone and I don't know what to do.

You can buy it in a shop but don't know which one right now

You can buy Deku sign in the Kokiri forest, Hylia sign in Hyrule town.

You have to buy new.