AirPcap alternative?

I saw this for sale online

its called the AirPcap but its £200 odd is there any cheaper alternative wireless card or device that would support the same

i know that it uses winpcap
and i know there are other wirieless devices out there that support winpcap which do not cost the earth.
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Get yourself BT4 or pentoo, both are Linux LiveCD's (DVD in the case of BT4) and have wireless auditing tools included. All you need is a PC with a wireless NIC supported by the tools available (all should be explained in the readme's and helpfiles) Both tools are free.
itchyalotAuthor Commented:
That is the problem i dont have a compatable wireless card thats why i needes Airpcap or a wireless usb card that would work with linux
Check Backtracks's forum link below, there is a list of wireless NIC's that are supported, get one of them:

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