As of my last knowledge update in January 2022, you can buy NFTs (Non-Fungible Tokens) from various online marketplaces dedicated to digital assets. Here are some popular platforms where you can buy and sell NFTs:
1. OpenSea: One of the largest and most well-known NFT marketplaces, supporting a wide range of digital assets and collectibles.
2. Rarible: A decentralized platform that allows artists and creators to tokenize their work and sell it directly to buyers.
3. SuperRare: Focused on digital art, SuperRare is a marketplace where you can buy and sell rare digital creations.
4. Foundation: A platform for buying and selling limited edition digital creations, often associated with well-known artists and creators.
5. Nifty Gateway: Known for collaborating with mainstream artists and celebrities, Nifty Gateway provides a platform for buying and selling digital art.
6. Mintable: Mintable is a user-friendly platform that allows users to create, buy, and sell NFTs with ease.
7. AtomicMarket: Associated with the EOS blockchain, AtomicMarket is a marketplace for buying and selling NFTs on EOS-based projects.
8. KnownOrigin: Focused on digital art, KnownOrigin is a platform that connects artists with buyers interested in unique digital creations.
9. Enjin Marketplace: Enjin is known for its integration with blockchain in the gaming industry. Enjin Marketplace allows users to buy and sell blockchain-based gaming items and collectibles.
Please note that the NFT space is dynamic, and new platforms may emerge over time. Additionally, the popularity and reliability of platforms can change, so it’s advisable to do some research and choose a platform that aligns with your preferences and needs. Always be cautious about the security of the platform and ensure it supports the blockchain that hosts the NFTs you are interested in.