Already have the stereo? If not check out crutchfield dot com. Radio comes with everything needed to wire it into the car and install it. (Wire harnesses that are color coded, no cutting required. Antenna adapter. Facia for our cars. And even includes step by step instructions how to do it.)
If you already have the radio, then buy the items separately. Aftermarket wiring harness, antenna adapter, and facia shouldn’t run you much more than $50.