Yes, you can add safety features like (Active) Blind Spot Monitoring to your car. Several cheap and inferior-quality blind spot sensors may appeal to you with their low price. However, for the sake of reliability, you should strictly not fall into that trap and instead, go for expensive ones. A good-quality Blind Spot Monitoring Sensor kit can set you back by about $400 – $600, while inferior-quality sensors can cost you less than $200. However, you can bring the cost down by installing the sensors at home only if you have professional guidance. Therefore, the safest and most effective way to install blind spot sensors on your car is through specialist mechanics/workshops. With that said, you should also do your research before adding a Blind Spot Monitoring kit to your vehicle by reading customer reviews and comments.