Microphone

Random 5$ mic or 10$ mic + camera.Possibly A4 tech or pay more for a cheap headset of Sennheiser.

If you would consider buying a new headset, if it comes with an mic is all you need. I personally use a $5 wire mic taped under the keyboard table. and it works just fine :p

Depends on your needs.

Well I've been using my phone as a mic actually :). All you need is a 3.55mm audio cord to connect it to your computer's mic. For android I use Gaz Davidson's Microphone app and for Apple I use iMegaphone. I think the cords should be cheap. I got mine form my mobo which came with it.

Might be worth mentioning what you want to use it for

I've used this one and it's probably my favorite, especially for being so cheap. The only thing is that shipping takes 3-4 weeks as it ships from China.

The Zalman mic on Amazon is pretty heavily recommended but I have no experience with it. Link

Seems a lot of youtuber's use Blue Yeti, but it cost more than 100€

AntLion ModMic Attachable Boom Microphone

I bought this mic for about $20. It has great voice quality. When I don't have it clipped to my headphones, I just twist coil it and slip it onto my shirt collar. I've had nothing but compliments on my voice quality from Skypers, TeamSpeak and various gamers.

Love it. Couldn't recommend it more.

No idea where you can buy it now.

http://www.amazon.com/gp/product/B005IT9P3G/ref=oh_details_o04_s00_i00?ie=UTF8&psc=1

I just wanted mic for talking with friends, so here comes really casual need. Thanks to you all for your help!

lol, you have the same avatar pic as me XD

but not me :<

there are lots of cheap dollarshops which have like 2 dollar headsets