outlet bypass for multimeter
You could easily build one out of an extension cord and some screw terminals.  If you can't figure out how to wire it up, you probably shouldn't be doing it.

But you likely won't find such a thing sold since the exposed terminals likely won't pass any safety certifications.  You also have to be careful to make a good connection with your probes, eliminate any arcing that might damage the probes or start a fire, not short them, etc. Current clamps are great in this respect since you don't have to have any exposed wire.

Overall the killawatt devices are cheap, accurate enough for most uses, plentiful, and designed to be safe.  If you need something higher quality, I'd stick with the $100 current clamp and an extension cord with the individual wires separated.