The museum in Santa Elena (p. 254) now costs M$10.
Hacienda Ochil costs M$20 to enter, unless you are going to the restaurant (or say you are). The cenote was covered in algae, though, and wasn’t very inviting for a swim. Not mentioned in the description are the very nice craft workshops.
Entrance to Uxmal (p. 247) is now M$95, and M$50 on Sun.
Sacbe Bungalows (p. 254) is phasing out its camping facilities, so don’t count on it; but it will soon be offering a larger house to rent, for a three-day minimum. It also has a new land-line telephone: 997/978-5158. Try that if you don’t reach someone on the other line.
The Ruta Puuc bus is M$120–but that might just be a low-season thing, as it seems odd that the price would drop.