The RTX 5090 and RTX 5080 will be available to purchase around the globe on January 30, 2025. On that date, the Founders Edition and MSRP-priced cards will be available for purchase, followed by all the other cards on January 31.

https://www.pcgamer.com/hardware/graphics-cards/where-to-buy-the-nvidia-rtx-5090-the-hotly-awaited-founders-edition-gpus-and-chunky-third-party-cards-are-already-listed-at-retailers/