the tuner box and all the other good stuff u need is gonna run u about $100. im not sure about waht the other car electronics places are selling, but the stuff we have at Stereo Advantage plugs right in and you can be up and running in about a half hour. you can pay either once a month, once every 3 months, once ever 6 months, and ocne a year. i would encourage you to ‘try it out’ for a month, but after that i would pay yearly. its $12.95 a month, but the longer u pay in advance, the mre u save…i think if u pay by the year, it wokrs out to be like $10 and change a month.