Relevant to those living in Metro Manila, Philippines:
I can confirm that retailers still have their hands on 2012 3DS XLs, particularly the red/black and blue/black ones. I was able to get my hands on the latter today from DataBlitz in Shangri-la Plaza. Not sure about other colors and/or limited editions.
The best part was when the store clerks themselves offered to let me test the unit in front of them for any defects such as broken parts/buttons, dead pixels on the screens, etc. This allowed me to peek at the firmware that came with the unit, which was 4.4 in my case.