Run your mic through a cheap mixer...
Radioshack has a $30 stereo mixer that mixes up to 4 mics, plus an aux stereo input -- all with individual volume controls -- into one single stereo output. You can plug your mics through the mixer, then plug the mixer into the amp. You'll probably need a Y Adapter (RCA stereo-to-1/4" plug) It should sound OK, if the room is not too large. Otherwise, you'll need a monitor pointed at you, because the sound-stage will be out of phase and you won't be able to "hear" yourselves and the sound will get a little confusing.
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