Bare Walls? Not during art month! Click on over to the MoMA store. There is a BIG winter sale happening with lots of exhibition posters (originally up to $45.) available for $2.99 - $5.99.
We really like the Lewitt poster(above) from 2000, made in celebration of the new millennium. It was $25., now it's $2.99.
For more info, see the sale section at the MoMA store.