Where can I buy Splinterlands packs?

Could you please tell me where I can purchase Splinterlands packs? I've heard a lot about the game and its unique features, and I'm eager to get started. Are there any specific online platforms or marketplaces that specialize in selling these packs? Additionally, is there any advice you could offer on how to select the right packs for my needs and budget? I'm new to the world of cryptocurrency and finance, so any guidance would be greatly appreciated.