Continental Arms has these in stock. My Class III nut buddies down in NC really like these. The .308 is supposed to be more accurate out to 600 yes than most cans which seem to work best inside of 300-400 yards according to them. Just hearsay.
The best part of Thunder Beast in their price category is their fantastic customer service. They go above and beyond and have for years. They know how to take care of a customer.