The Royal Pin is not a special Chapter 3-only item; in Deltarune Chapter 2 , you can buy it from Swatch in Queen’s Mansion for $1,000. It’s also Noelle’s starting armor, and it can be sold at any shop for $500.

Where to get it

  • Shop: Swatch’s shop in Queen’s Mansion.
  • Chapter: Chapter 2, not Chapter 3.
  • Price: $1,000.
  • Sell value: $500.

Quick note

If you meant the official DELTARUNE character pin merchandise for Chapter 3, that is a separate product and not an in-game item. The official Chapter 3 pin set has been sold through Fangamer Europe.

TL;DR

  • In-game Royal Pin: buy from Swatch in Queen’s Mansion for $1,000.
  • Chapter 3 merch pin set: official product sold by Fangamer Europe.