Hello this is my first time replacing my tires and I have few question. I'm thiking of purchasing my tires online and have them installed myself (I'm going to take it to the shop that I know where I can have them installed free) my car is 2003 honda civic lx 4dr and basic tire comes about 50 dollars online and 4 pieces for 230 including shipping fee. If i take my car to pepboys or sears auto, midaz or etc., will there be a lots of difference in cost? (I heard they include installing free and some of them do it for free)