Fee: $1.50 service charge per permit.

From the news release: "The permits are free, however, there is a non-refundable $1.50 service charge for each permit obtained."

Must be like the Whitney permits: They're free, but the reservation is $15.

I'm pretty sure Snake Dike and the face would be free:
"These permits are required for the use of the trail from the base of the Subdome to the summit of Half Dome and include the Half Dome cable route."


Looks like day hikers only get 300 permits:

Four hundred permits will be issued per day, 300 of these will be Day Use Permits and 100 will be included in wilderness permits. These permits are required for the use of the trail from the base of the Subdome to the summit of Half Dome and include the Half Dome cable route.