The CostCurrent monitor is available in the USA from,

http://www.currentcost.net/buynowmain.html#Extra

What looks interesting is also the Google Power Meter and the Current Cost Bridge device which allows you to record your power consumption 24/7 without having your own PC on all the time as the data is recorded with the online Google Power Meter server.

http://www.guardian.co.uk/environment/2009/oct/28/google-powermeter-home-energy-monitor

I may have to look at getting the CostCurrent bridge device!