We had tickets from our hotel to get the chairs and umbrellas so not sure how much they actually cost but I'm sure not more than a couple bucks per day.
The beds rent for $800 pesos a day ($80 US dollars) Not bad if you have a group that wants to split the costs. I still think the beds on the beach are a little wierd.
Couldn't quite get used to them. But, you have to keep your eyes open to new experiences everyday, right?