Cheap Quiet PSU 200W - 300W

Is this for a very old system? I don't think there is much market for 200w power supplies nowdays.
 
the system is about 3 years old and is a dell. it currently operates on a 200W PSU but when moving to a new case i dropped the PSU and now its very loud even though it seems to work fine. So all i wish to do is replace it with a really cheap one (as cheap as possible) which is nice and quiet
 
Why would i have to go with a DELL PSU instead of just using a much cheaper regualar PSU
 
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