You can usually get them for any car; mostly they are generic with a few options to help them fit your car better. Like, if you have power door locks or power trunk release, you'll probably pay a bit extra to have that functionality incorporated into the key fob that runs your auto-start. In the cases I've had them installed, it was like $25 or something cheap.
I would recommend finding a good local auto-start place to buy from and have the install done at. They're usually the same places that sell car alarms and stereos. Pay attention to how much range you get (some starters can remote-start from a mile away; others only 1/4 mile) and safety features. Otherwise... best thing to do is just head down to the shop for some education.
edit: the sticky part comes with factory car alarms: Sometimes the shop needs to install a new relay or somesuch to keep the stock alarm from flipping out when the new kit is installed. I think for my Saturn, it was another $25 to do that. You can get nickel-and-dimed if your car has bells and whistles, but all in all, it IS a good investment especially if you live in the cold country.