Mommy Makeover without being a mommy, is the risk higher? Is there a price difference?

Not having children does not factor into results or complications. Basically a mommy make over is a tummy tuck and either a breast augmentaion or a breast lift with implants. if you have a history of weight gain and loss you put the same stress on the skin and underlying muscle.

Hello and thank you for your question. There are many patients who benefit from this procedure who have not had children yet.  It really depends on your individual body. 
Make sure you specifically look at before and after pictures of
real patients who have had this surgery performed by your surgeon and evaluate
their results.  The most important aspect is to find a surgeon you are
comfortable with. I recommend that you seek consultation with a qualified
board-certified plastic surgeon who can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon