Official online servers were shut down on September 1, 2021.
Sites like OZON or Yandex Market may have remaining stock or used copies available. Abandonware Status need-for-speed-carbon-free-download-pc-game-full-version
You can find used or new physical PC discs on eBay , often priced between $10 and $35 depending on condition. Official online servers were shut down on September 1, 2021