Just need a microphone for my computer, either kind will do. I will also consider a webcam with a built in mic, but I don't want to pay very much, so would prefer just a mic/headset-mic of some kind.

If you have regular headphones, I'd trade my headset for them. They're a logitech headphones with mic from Wal Mart.

I need headphones for my MP3 player. :\

They're like... $12 from wal-mart, and their logitech, so they work well.