I have 4 fermenters available for sale, all less than 4 years old. $1,500 a piece (currently retail for $3,579). This 200 gallon kombucha fermenter is built with high grade, non-corrosive, easy to clean, premium virgin 304 stainless steel. It features welded on wheels that make it easy to move around as needed. The durable build of this fermenter is ideal for any kombucha brewer looking to ferment larger batches. When choosing a kombucha brewing equipment size, consider that kombucha brewing time is typically 7 to 30 days. This means that the batch size you brew should be large enough to produce both kombucha for drinking, and starter tea needed for your next brew.