There is a big market for electronics and car accessories in Al Naif Market, Dera, Dubai ( I can guide how to go by metro or cab if some one wants to go there). There you can get a lot of things but you need to see if they can fit your car. Usually most gadgets and accessories are universal. Like the parking sensors and rear view LCD these are for all cars. I usually give refrence of Suzuki Celerio when buying items for Wagon R because almost all things fit in for the same size.
The prices for them are usually low but you can bargain with them. For example the parking sensors I got were for 50 AED or approx 1450 PKR. Now you have same sensors in 90 AED and 120 AED. The diffrence is number of sensors and little bit of quality.
The LCD is for 150 AED, approx 4500 PKR. Vacuum cleaner for 70 AED as its branded, other wise you can also get vacuum cleaner for 35 AED or 800 PKR. Depends which one you want.
You can also get a lot of good faily use stuff from any carrefour mart, especially the one in Mall of Emirates.
I will post more once I install them in detail.
Any other questions, I will be happy to answer brother.