@Phira & @eilis1228 - We did purchase the IKEA Ektorp chair for our nursery. It is currently built and being used...we just haven't converted it to a rocker yet. It's very comfortable. I agree though, it's not the same "look" as the Karlstad if that's what you're going for.
Have you checked out Cost Plus World Market or Pier 1 Imports? I feel like i've seen sofas there that look similar to the Karlstad. No idea on price though. I've also had luck purchasing furniture on Overstock too. I know you can't try it out ahead of time which is important with something like a sofa...but I did purchase my dining set there a couple years ago and love it! Just some ideas.