The state has the right and the power to regulate commerce.
You use the word "right." Who says so? Who is speaking? Are we to take your word as our command?
While the state cannot outlaw a particular reason a woman wants to have an abortion, they can prohibit trade and profit off of the process,
Nobody was ever talking about the state making it illegal for a woman merely to
want a sex-selection abortion. The discussion was about actually getting one. The state can certainly outlaw a particular reason a woman
gets to have an abortion. Prohibiting trade and profit off of the process is just another way of saying they've outlawed getting an abortion for the reason that somebody's paying you to. That's every bit as much criminalizing a reason for abortion as if they outlaw aborting Down's kids, or they outlaw aborting a fetus due to its sex or race, or they outlaw aborting because you don't want to carry your rapist's child to term, or they outlaw aborting for any reason except to save the life of the mother.
in much the same way it is illegal to sell body parts for transplant operations.
Which is to say, it's illegal to remove one of your body parts and turn it over to a transplant patient for the reason that he paid you to.