Hall Effect for outlet strips

So on the NANOG list, there's a thread on where to find a rack-mount
outlet strip with per-outlet measurement, for bill-back purposes in
a server hotel environment.

The data so far is grim:


> {baytech}
> I had moderate success with this suggestion. Their technical support said
> the only product they had that does this is the 4 outlet RPC5 or RPC6
> (ethernet version vs serial version). Unfortunately, it costs $644 each
> (lowest price I've found so far) and accomplishes it's individual
> monitoring by replicating power in and power out plus an ethernet port 4
> times. Still, if it's the only one out there I guess they win (although
> at $150 per outlet, ouch, that goes over my $4000 budget for this).
>
> http://www.baytech.net/products/prodlist.php?show=RPC5

And it's not UL-approved.

So I was thinking; is there a Hall-effect package that could
cheaply tell you raw amps at least on each of n outlets?


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