Here is one of many: How Much Would the iPad 2 Cost If It Were Made in the U.S.? About $1,140 - The Atlantic
Although that cites a price of $729 (probably the pre-iPad 3 price). I grabbed the $400 price from the Apple Store when I made that post. Apple's refusal to lower their 38% - 55% profit margin has a lot to do with it, i'd imagine.
I don't see American workers ever working in the conditions that we see in China, and thats a bad thing. People over here have this idea that they should get paid for doing a crappy job, simply because their job is "hard".