Can I buy BP Coin from the shop?

Yes - BP Coin is on sale right inside the Battle Pass screen.

To open the purchase flow, tap the BP Coin icon on the Battle Pass screen. Three bundles are waiting for you. The Small bundle is a quick top-up for a few skins. The Medium bundle is the comfortable middle ground. The Large bundle is built for collectors going deep into the Archive, with the best per-coin value of the three.

Bundles work just like regular Coin packs: pick the size, complete the purchase, and your BP Coin balance updates inside the Archive tab.

Quick tip: if you've already bought this season's Elite or Elite+ Battle Pass, you're sitting on the fastest BP Coin source in the game. Combine that with a bundle and the Archive opens up fast.