We get only slightly lower prices, because the companies keep large profit margins. Anyway, we don't build wealth by driving toward the rock-bottom of wages and costs. We build wealth by increasing wages over the years and decades and keeping the money in our economy instead of letting it flood out to other countries as it's doing now.
Slowly but surely, we're impoverishing ourselves. Of course, the situation is extremely complicated, and not to be analyzed in a sentence, but the bottom line is that there's a large net negative in outsourcing.
"Slowly but surely, we're impoverishing ourselves." 
That's the ENTIRE POINT and focus of Karl Marx's Das Capital...that every capitalistic economy will grow progressively poorer each year until the workers all inevitably rebel against the ruling class.
Of course, Marx has been proven wrong decade after decade (care to compare the U.S. living conditions in 1920 with half of our country not even having running water or electricity to today, for example)...but being proven wrong again and again hasn't stopped Marx's useful idiots from parroting his long discredited spiel over and over again...