Futons In SD
I purchased one from El Canal , not the department store but around back on the side is a funiture store by the same company. They only had a few different frame models, from basic metal to wood, but loads of different covers on the second floor. I have found it to be a decent store with friendly staff, they even let me use the phone to call my wife to decide on the cover color, ask for that in Plaza Lama.!! my neighbour liked mine so much, I went back a month later to pick one up for them.
Good Luck...