If you're in the US: us.pulsar.gg
If you're in Europe: eu.pulsar.gg
If you're in Japan: jp.pulsar.gg
If you're in Korea: kr.pulsar.gg
If you're in the rest of the world: pulsar.gg
In addition, you can check a list of available stores nearby on this page: pulsar.gg/pages/where-to-buy