Looking for a good source of cheap posters

[bazookaman]

My office is covered with things that catch my eye. Not necessarily posters but just about anything that will hang on a wall. Articles, ads, postcards, etc. I DO have a couple posters also. As far as lighting goes, my office has horrendous fluorescents so i just keep them off. I have a nice 3 way torch lamp in the corner that provides enough light for me to work on my computer w/out any eyestrain.

My office apparently has a life of its own btw. I came back to my office after a meeting to find several people just "hanging out".