Mia Cumberland
Google
I'm studying abroad in Shanghai this summer, so I took a free rainy day to go check out this museum. It was very cool! Not too hard to find, and I'll include instructions at the end for how to get there. There were a bunch of posters running from the early 1900s to the 80s. They had little info blurbs around groups of posters talking about the era and circumstances. At the end there was a gift shop where I got my own propaganda poster! My ticket was only 25 yuan, I bought it in person upon arrival, and the people there were very nice. I tried practicing the Chinese I spent 3 1/2 semesters learning, but they kept responding in English so no worries for those who don't speak Chinese ;)
As for getting there, a couple of these reviews are right about the new address. You can plug in 726 West Yan'an Road or the name listed (上海宣传画艺术中心) into Google Maps or Baidu. It will drop you in front of two tall buildings connected in the middle. Facing the buildings, you will see building 726 (the building the museum is in) on the right, and 728 on the left. I walked in to the building that connected them, turned right to the elevators, and rode to the 7th floor. When the elevators open, there is signage pointing to the museum. Have fun!