I haven't seen one go for $2200 in at least a year. Used prices were about $1800 before the Mark 4 came out (a bit more or less depending on condition), so prices did fall as expected but not by that much. FYI I bought a 5D3 earlier this year brand new from B+H for $2150 after rebate.
The $2,200 a couple of weeks ago was actually the Canon price new. I think Canon still has it listed for that price, a little less for B&H and Adorama. It looks like the prices are leveling off at about $1,500 for low shutter clean bodies.