I was living and working in Seoul when Rent did its farewell tour, and I saw the production twice during its 2-week run. I have 5 of these posters, which they were giving away. I doubt you'll be able to find many of these outside of Korea (there weren't many foreigners in attendance, if I remember correctly). 

The posters have small creases on the sides (see pics). These would not be noticeable if the poster is framed. 

They measure 18x24, and they've been rolled up for the last 10+ years (I never displayed them).

The small flyers in the last pic are not included, as I only have one set of those. I added this photo just to show that the posters are from the Korean run :-)