seems a little high but audio shops are normally a rip off anymore, but yea, if a unit doesn't have it already (most mid class don't) it can be added on to most. If your wanting to stay in that price range i highly recommend the lower end Eclipse or Kenwood Ex, I've had the same Eclipse for the last 9 years with NO problems (except had to have the laser aligned after a wreck) and it still sounds great and plays everything. I also have a mid class Kenwood in my S-10 and i LOVE it for the price, wish i would have went up to the Ex but still a great unit!