rdab I went on a search for the smoker also. I don’t believe that there are any available in North America.
This must be a very popular item. No dates to be found when they will be back in stock.

rdab I just saw that they are out of stock online. Sorry

craigrice I found them at Home Depot for %$ dollars

https://www.homedepot.com/p/Masterbuilt-Electric-Slow-Smoker-MB20100112/304339182

I have one that is for any of the electric Mastercraft smoker. It mounts on the side where the chip tray goes in. You remove the chip tray tube and use that for the mounting of the new cold smoker. They cost around 60 to seventy buck. I believe Amazon carries them.

craigrice These are great. I use wide mouth mason jars to put them in and I vacuum them with mason jar
attachment on my vacuum sealer. They keep indefinitely sealed like this.

Joe Hell That side cold smoking attachment is worth its weight in gold. Really completes the unit.