Well you should wait because I have heard that tracking World is introducing Parking Sensor and Side View Cameras for Honda Civic. I am desperate to get both of the things. I'll keep you updated.
I have also searched for parking sensors. If you want to install the one without LED just the buzzer one they should cost you below 3000 rs. I don't suggest installing one for cheap LED Screen in Car when there are already imid and navigation head unit. They should give us some kind of parking sensor which should be connected to the navigation unit. It will look nice at least to me.