Walking around bag for canon 70-200mm lense?

Just bought my very first camera and lense; digi rebel xt w/ 70-200mm f4L! It arrives tomorrow and I forgot to buy a bag for it!

Does anyone have a good walking around bag for this combo? I am looking for a holster type case that could fit this monster. I am also interested in any tips you guys have regarding keeping this thing as mint as possible and still using the snot out of it. Also if anyone knows of a good local camera shop to buy this from in the SJ area, I would happily buy it there.

Thanks,
Matt Winans