Be prepared to sleep in a tent outside the office that is in charge of handing out the tickets. It is like trying to get into a rock concert. There will only be 2-5 tickets available per day and we saw people camping out waiting to get them. (This was during the week of April 10th-April 21st..Easter Holy Week & Spring Break). I can strongly recommend staying at a hostel called Casa Mariposa, located just 20 feet from the start of the trail head. The owners are INCREDIBLE, you will get a solid night of sleep and be treated to meeting people from all around the world. Enjoy!! -TL
The permits were (Feb 2014) USD 15/person/day + USD 10/person/night at Base Crestones. Under the normal climbing schedule one would pay USD 40 then.
And yes, getting the permit is a pain in the ass. There are several sources describing several systems being presumably in force there. Our experience says that the only system is be there VERY early and try to talk your way to the tickets.