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I'd be excited to try to make kombucha. I've made tempeh once before and I remember enjoying the process.

Your local grocery store may carry a "Plain" version of their live kombucha. This would be enough to start a SCOBY. Alternatively, you can buy Kombucha scobys online from various places, rather cheap. There are quite a few kombucha DIY videos and posts around, you'll find it's quite easy and delicious. :)

Tempeh requires special equipment as it must be kept 86-90° F. Kombucha is an easy starter culture. You don't actually need to start with a SCOBY or unpasteurized kombucha if you're having trouble finding any. Just add a few tablespoons of vinegar to your 1 gallon tea:1 cup sugar solution. The first batch might not be so good but the second will be fine.