Jenny with Nourished Kitchen has put together an online community swap for kefir grains, kombucha scobies, sourdough starters, and similar items. If you have ever wondered where to get started in finding one of these items, this would be a good place to check! The only thing you would need to pay is the shipping.
And, if you are inclined to stay local, check out craigslist.org and freecycle first. If you can find your item locally (some people have all the luck!), you will probably have to pay something for the item and some gas, but probably not much! I have yet to find my kombucha scoby... I'm laaaazzzyyy... but it is coming soon!
And, if you don't know what the heck I'm talking about, google kefir and kombucha! You might be surprised at what you learn!