Hi there!
We had the Royal package - the issue is that they actually charge in Pesos, not US dollars, and the US dollar is currently not 10:1 with the Peso, like they put on their website, more like 12.5:1.
We brought a cake knife, but they provided everything else. They would provide a cake knife too if needed.
I did get my hair done at the Renova spa, and although I have pretty long hair, by their standards it was only medium length. They did a great job - they do not however speak any English, so try and bring a picture of what you want.