New to dinghy TOAD towing

So I went ahead and bought myself a used 2000 Saturn SL2 automatic vehicle, really great deal just under $1,000. but what i didn't do was look into the cost of a tow package and braking system. the few estimates i got are double what i paid for the car itself. I know i shouldn't cut corners and go cheap on the equipment but does anyone know of a website, place of business, or any other way to get the equipment from? I am pretty handy and have tools and means to do it myself. i live in the Bay Area California and i have went to CampingWorld and a few RV service locations and i feel that the cost are way too high.