A cold brew "maker" is not a complex thing. All you need is coffee grounds sitting in cold water for a day or so. This can be accomplished in multitudinous ways.
We have a gallon jar with a tap at the bottom and a tall 3" diameter mesh filter with a flange to sit under the lid. I had to (food-safe) solder the filter back together after a few years, but it makes a huge stack of strong brew with which we are most pleased.