You can go past it with a Logitech C920.
The daul camera idea sounds interesting. I can't wait to here about the results.

I think the most common use of multiple cameras would be something like a sitcom where you have a couple cameras with longer lenses for some close ups/reaction shots with another camera with a wider lens for the 'master shot'. You might also see some setups like this for action shots.

The problem with a webcam is you are stuck with an ultrawide angle lens, so if you want some close up shots the camera it's self will have to be very close to the minifig. Sometimes people worry about DSLRs not being able to get very close, but if I did a setup like this I could have the wideshot with a 24mm or 35mm lens and the close up shot using a 105mm lens with some extensions on it and both cameras would be a foot or so away from the set and neither camera would be inside the others shot.

And additional problem with two small cameras you have to position very close to the set is you now have two cameras you have to worry about bumping as you animate. It is true that you could switch to the other camera is you bump one, but cutting at bumps is going to ruin any good creative cutting choices you might have.

In addion you will need to light your set in a way that looks good to both cameras, if I change camera angles it usually takes me a bit (sometimes hours) to set the lights up to work with the new angle, you might end up with only really plain lighting options, or need even more complex lighting setups then before.

This seems like a real stretch, if you need to order something from bricklink there is no way your set, camera, and lights wont get bumped or just sag while waiting for the part, I would bet money you never end up using your extra camera for something like that, and I really doubt you have enough lights to have two sets independently set up at one time, I always want just one more light when I make stuff, spending money on lights is typically a much better investment then spending it on cameras

I really don't think my post was a debate, it just highlights the reality of some of a webcams shortcomings, keep in mind if both cameras are about the same distance from the set you aren't going to get much use out of the two takes unless the camera angles are dramatically different (cutting between two simaler shots is just bad editing and can be visually disorienting) Just keep the 180 degree rule in mind when you are setting up your shots.

I agree with Sloth, it seems like a waste of money to me. You're probably better off saving the money for lights, or more LEGO, or something else.

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I agree with everyone else here. You could save the money for lights, LEGO, or even a DSLR one day.

Sidenote: Dragonframe can handle interchangeable cameras.

The new KB Videos coming soon.

live action, stop-motion, it still comes out to be a film. I'm not discouraging you on using more than one camera, but it would be more practical to just use one. But hey, I've animated with two cams at once, and it's not as bad as it seems.