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What's a good small-batch fermentation vessel?

After getting started with a few kits, I'd like to start experimenting a little bit. I'd like to start off with 1-gallon batches on anything I'm not sure about, though. I have a growler that I'm considering trying to fit an airlock into, and I've also seen some people mention using the 2-gallon fermenter from the Mr. Beer kit for small batches. Are there any other good options?