I have several prices listed, from my Freedom of the Seas spa menu from last summer. To find it, log in, click the "Find" tab at the top of the post, type in "RCCL menu of spa services". It is there, with some prices listed. That should help.
At the end, when they ask you about buying products, I try to not let them bother me. I just tell them, I recently cruised and bought some products and I don't need anything now. I lie!