I am selling a pretty much brand new iMac that I bought this year from Costco. I have the receipt. This model had the upgraded GPU and the ethernet connector on the power supply. It's blue color. No scratches or anything. Only used a months. I paid $1549+tax for it. Asking $1200 (approx $500 discount for brand new iMac). That's a huge discount.
This thing can pretty much do anything. Super bright screen, lots of power and memory+storage and amazing sound and video camera. This is the Costco listing.