You can make your own by ordering the starter.
www.culturesforhealth.com/starter-cultures/kombucha.html .
Natural foods stores is one place to look for it ready made bottles of it. Some of those have more sugar added for taste, which isn't good for bacterial infections. There have been discussions on here about
it. You can do a search on "kombucha lyme" to find them. Some advise against it and suggest kefir instead, but I don't recall the reason for avoiding it. You can also make kefir with starter from the same company.