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The Yokogawa meters run about US$650 new. They're really nice however. Mirrored scale, taut band suspension, double mumetal sheilding for the movement.An alternative might be the Gossen Metrawatt Power meter. I think Dave used one in a review.
If you buy a cheap standard 60A household meter you can make current transformers to increase sensitivity. I did that for myself, using a 10:1 CT to drop the FS range from 60 to 6A, it just reads 10x faster.
Electrical wholesalers or other electrical suppliers for the meter. The core is not a ferrite but a wound core from a small toroidal transformer, or you can use any small mains transformer and remove the windings with a knife and use the core and the bobbin. You are winding 2 simple windings, one of a single turn of 10mm wire as the secondary and a 10 turn one of 2.5mm wire as primary.
Any one will do, depending on what you want to do. They both have advantages and disadvantages for measuring.