What sort of features are you looking for in the proxy server? If you just want an old server, you could check out retrobox.com, they usually have a fair amount of old corporate servers, they're reconditioned, but you can pick up a bargain there pretty cheap. I got one from them a few months ago, and it's been working well for me.
Or if you live in an area where there is a recylcling program for businesses you could try contacting them, they may let you have an old one for free.
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Or if you live in an area where there is a recylcling program for businesses you could try contacting them, they may let you have an old one for free.
Hope this helps