The body market

"Skylar Cruz found her sister in the Real World-only to learn that her sister has betrayed her and put everyone in the AppWorld in danger. The Body Market is now open for business and everyone still plugged into the App World is for sale. Shaken by the betrayal of everyone she trusted, Skylar is through being a pawn. She may be the only one who can stop what her family started. And she has to do it before the AppWorld runs out of time"--Amazon.com.