Analog Devices still do - AD633 etc.
Which must be a better way of doing it, given enough resolution on the A/D converters (especially the current, which has quite a wide dynamic range). The analogue multiplier approach needs great care with zeroing and offsets if you want to be able to accumulate an accurate kWh count. You've got to handle current up to 100 A RMS, with some allowance for crest factor - but most of the time it will be measuring down in the mA to 5 A sort of range.