Perhaps they're missing the point but the harvesting of fetus' and embryoes is the main concern of the objectors.
I should point out that stem cells are also sourced from unwanted IVF embryoes - when a couple does IVF they extract many eggs and fertilise them all. They are frozen in case the first attempt at insertion fails. If they are successful and the couple doesn't want more children then they are simply thrown out but they can be used as stem cells.
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The selling could take place if the fetuses become high in demand after a few years of research, which could use up the majority of the aborted left-overs. If the scientists need much more, they could turn to paying women to get pregnant and have abortions. But hey, since there's so many abortions everyday everywhere, there would more than likely never be a dead fetus deficit.
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That's why we invented this marvelous concept called "Regulation". There used to be a market for bodies for medical science but a law was passed banning people from selling bodies for money and thus depriving honest grave-robbers of their employment.