Irulan nailed it. Every shop is different.

Also keep in mind that different shops sell different brands. Don't think that there is only Trek, Cannondale, Specialized, and Giant. I'd encourage you to look at shops that sell other brands. In my experience, shops that carry bikes other than the major brands tend to be better shops and give better "perks" post- purchase. Just my opinion and thought... not necessarily true for everyone.