It is an option, not standard equipment.
Not as a factory option.
$99 is the remote starter by itself, there is a drop down installation option that includes the security interface required by newer cars and also the unlock option if your car has power door locks.
No, remote start was not a factory option in 2000.
Any car can have remote start, some cars you may want a dealer or an authorized mechanic to handle. I don't however think you can have a remote start system on a manual vehicle.
Walmart sells a variety of remote control cars. They sell remote controlled, trucks, cars, race cars, trains, and even police cars.Above and beyond this they also sell remote controlled helicopters.
This feature is available from some car companies such as Subaru. However, the majority of remote start systems are installed aftermarket. Viper is an excellent company to look at if you are considering a remote start system.
Remote starters have no effect on other cars.
Battery powered remote control cars are more efficient and economical.
Some examples of control consoles available for remote controlled cars include the traditional remote control gun and a joystick. It is now even possible to reprogram a universal remote control to work with remote controlled cars.
One can find a remote control for cars in car company retail stores. In addition, one can find a remote control for cars online in stores such as Amazon.
You can find some good information on remote control cars at the HobbyTron website. Amazon and eBay also offer good information about remote control cars.