Where can I shop for electronics in Seoul?

Hi, I am coming to Seoul, South Korea at the end of june this year and I want to find this particular phone (Sky Vega Iron 2 im-a910). Would anyone living in Korea know where possibly I can get this phone - brand new, so not refurbished or second hand. I would really appreciate your help as I know this is an old model, but I have been trying to search on Google for it in Korea.

While I'm on it, what and where are the main shopping malls for decent pricing of clothing, footwear, cosmetics etc. Thank you.