The peaks that currently require permits are Mt. Rainier, Mt. Adams, Mt. St. Helens, and Mt. Shasta. Current rates are:
Mt. Rainier (25+: $48/each; 24-: $34/each)
Mt. Adams (Weekend: $15/each; Weekday: $10/each)
Mt. St. Helens ($15/each)
Mt. Shasta ($25/each)