Ebay has a few different posters (search posters AND bicycle), but if 19 bones is too much, you may not have a lot of options re: posters. You can try:

http://www.bicycleposters.com
or
http://www.callihan.com/art/bicycles.html

or some such poster link.

You might look into getting an old catalogue from http://www.velo-retro.com and blowing it up to a poster. They have a great T shirt with the Desgrange quote on geared bikes...

Cheers

Cam