If you're looking for Poker game source code developed in Unity 3D, you might want to explore various online platforms where developers sell or share their game projects. Here are some steps you can take:

Unity Asset Store: The Unity Asset Store is a marketplace where developers can buy and sell Unity projects, including game source code. You can search for "Poker" or "Card Games" to find relevant projects.

    GitHub: Some developers may share their Unity projects, including Poker games, on GitHub. You can search GitHub repositories using relevant keywords to find open-source projects.

    Game Development Forums: Forums like Unity Forums or Reddit's r/game dev classifieds might have developers offering Poker game source code for sale or sharing project links.

    Freelance Platforms: Consider hiring a freelance game developer to create a custom Poker game for you. You can specify your requirements and budget on platforms like Upwork, Freelancer, or Fiverr.

    Customization: Once you acquire the source code, you can discuss additional features or modifications directly with the developer. Be clear about your requirements and negotiate any extra payment for additional features.

When considering Poker game source code, make sure to review the quality of the code, compatibility with your target platforms, and licensing terms. Additionally, discuss any desired features or customization options with the developer before making a purchase.