I picked up a PSC 48 Phantom Mic Power Supply for $50 used, and also have a very small unit that came with a Shure omnidirectional mic. Both are battery-powered and clip on the belt. When plugged in, I use a Samson S-amp, which has other uses too. My old TC Helicon Voicetone Create XT also supplies phantom power, and about 200 effects to boot.
They all work well with my ATM-350 condenser mic. Just be wary that not all Phantom power supplies actually supply the full 48V.
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