I was there Sat. Don't know or never heard a flat hourly rate stated before, but I was there about 2.5 hours and paid $20. They keep a log in a simple notebook so there must be a hourly rate.
Call em up and ask: 985-974-4201 Mike and his father Jimmy. They now close on Mon and Tues.
Expensive for what it is unfortunately. Owner is cool, but the hourly fee is a bit up there. Designed mostly for blaster style work. Anything serious and I'd want to go to Honey island or something a bit more nice. YMMV