I’m looking for an IMU with a good accelerometer (low drift and noise) at a fair price. I’m considering BNO085 and MPU9250, but I’m open to other options if they’re cheaper or similar in price.
The goal is to create an AR navigation system based on a pre-recorded route with waypoints, so accuracy is important.
The obsolete, long discontinued IMUs you are considering are not "low drift and noise". Modern replacements are significantly better, but more expensive.