Here are 4x2' designs: http://people.ubuntu.com/~jpeddicord/files/u-oh-banners/
The -orange versions have orange backgrounds with white text, and
-white is a white background with full-color logo which is cheaper to
print.
If -text is in the name, it also has our website and IRC channel. I
think the orange without text would look best on the table, but really
any of them will work.
Cheri mentioned this on IRC:
http://signscolumbus.com/bannerscolumbus.html
Their prices look pretty reasonable. I can chip in to the cost and
will also cover the difference of using the orange background if we go
with that.
