The stores that I've been to don't seem to carry 'L' lenses in stock, probably because they're such an investment. But I'd like to be able to look through them before I buy. Any recommendations of a place that might have pro Canon lenses in stock?

I live in SE Wisconsin and can get to Chicago easily, but it just so happens I'm taking a road trip to CA and back, so anywhere along the way (WI-->IA-->NE-->CO-->UT-->NV-->CA) (CA-->AZ-->NM-->TX-->OK-->MO-->IL) would be a worthwhile stop.

Ideas, anyone?