I got some good stuff of Ebay. You can get a card to fit in a PCI slot on your PC and link cameras up to, then you can remotely view from anywhere with an Internet connection. It can also record movement in a defined area if you wish.
Something like the following is good for home or small business use.

http://cgi.ebay.co.uk/Security-Syste...QQcmdZViewItem

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