I agree with you, the $35 was a big chunk of money. I've always looked at tips for massages (and hair, nails, etc) as that is what the person is actually bringing home. The actual fee is for the building, spa environment, owners and tools needed for massage (heer, the stones).
If I think of it that way, $35 isn't extremely terrible for someone who is an expert in their craft. There are other massages available for slightly smaller prices, that may be within your acceptable limits with tip included. I've always wanted to try the bamboo massage, which I think was a bit cheaper.
If you're looking for something pampering but maybe not particular in what it is exactly, you can definitely wait until the cruise and see what specials they are offering. We got pedicures done that way and it was very relaxing as well. The Rainforest Spa is also great and that you pay per day.
If you're unsure of the Rainforest Spa, it's a co-ed place in the spa that offers rainforest style aromatherapy showers (4 of them I think). Also in there are multiple steam rooms/saunas but the best part are the heated tile loungers! One of my favorite memories of another cruise was relaxing on the warm soothing tiles and just listening to the waves. They require everyone to wear robes while in the Rainforest Spa and I'd say almost everyone had their bathing suits on as well (if you used the shower, they all did).
There are plenty of options to pamper yourself without having to pay the large price tag of the hot stone massage. I haven't tried a bad one yet!
