Never fished Hidden lakes, but a permit for the year will run ya 35 bucks or a 2 day one will be 15 bucks.
And the trout farm is Lake Julian in Cary. You should be able to get something there but remember you're paying for it. 5.00 a pound I believe is the rate there + cleaning fees if you want that if you hit the Trout Pond. The Big lake has a hodge podge of fish and costs something like 8 bucks to fish.