Need a router/firewall that will give me URL filtering based by individual pc's

We have 10 computers, 4 of them are in a small computer lab.  I would like to restrict certain websites for just those 4 computers that are in the lab.  Does anyone know of a router/firewall that can do this.
These computers are not on a domain.
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if you have a spare old pc, doesnt need to be that high spec you could install Linux Fedora or another dstro and run dansguardian, its an opensource web filetr and very good / easy to use
Sonic Wall can do this easily

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and so can IPCOP
ipcop has the dansguardian and ClamAV addon, a breeze to install too
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Sonic Wall is probably the best solution.  
lmao probably

I've used both, down to personal opinion really
You do this additionally with the Cisco ASA very easily and the Microsoft ISA Server.
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