Advertisement posters from 1930’s Shanghai have been trendy for a while. We’ve been seeing them in almost all the upscale Asian-fusion restaurants in the Bay Area, such as Straight’s Cafe, Shanghai 1930, and Betelnut.
Here is a site that collects them.
Shanghai Poster: Vintage Decorative Art.
Apparently you can get them from flea markets in New York City for a buck or two a piece (via Zeldman’s Daily Report).