Now days all you need is a computer, tablet or mobile phone and a fast internet connection. You then join a video conferencing company that handles all your conferences on a secure server. The one I use is called iwowwe and only cost
under $200. I can have up to 12 on cam at one time and over 1000 people on mic.
They proved you with all the software you need, so you dont need to go and buy any fancy equipment.
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First, instead of using dedicated hardware, consider using software like iChat, Windows Meeting Space, or Skype. Other than that, eBay is a good place to look for used equipment.
Video equipment can be purchased from all good video and electronics stores. Try the local area. Alternatively, visit webpages such as Amazon or Ebay.