We have introduce a few nice Portal turret replicas. But if you want a more realistic model, the following USB Portal 2 sentry turret desk defender should be able to draw your more attention.
This is an officially licensed, highly detailed, interactive replica based on the sentry turret in the universe of Portal 2 video game series. The mini Portal turret measures 7.5 inches tall, and comes with exquisite details and accurate colors from the original design. Most importantly, the Portal turret desk defender features a built-in motion sensor. When connecting to your USB port, the sentry turret will be activated and monitor your desk. If detecting any movement, the Portal turret will open its wings and alert with its iconic sound effects pulled directly from the games.
The USB Portal 2 sentry turret desk defender is priced at $39.99 USD. If you’re interested, jump to ThinkGeek for more details.