One can purchase a Lavalier microphone from a variety of different locations. They are available from Amazon, Guitar Center, Zzounds, Musician's Friend, etc.
microphone
Wireless lapel microphones can be purchased at many retail stores. The Source, Radio Shack, and Amazon all carry various lapel microphones which one may find suitable.
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you have to buy a webcam with a microphone
The main purpose of a lapel mic, also known as a lavalier microphone, is to amplify and capture sound from a person without the need for them to hold a microphone. It is commonly used in situations where the speaker needs to move around freely or if the sound source is at a distance from the recording device or PA system.
Lapel microphone are the best for studio but if you are feeling that they are super expensive so please look at audio-technical Atm-510 and Shure SM57. These two models are less expensive and they have good quality also.
Buy it in the internet
To Get a Microphone you can either buy earphones with a microphone attached or it comes with the newer version ipods, on the bottom :)
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no you have to buy a in jack mic card to put in the laptop