Trying to determine the route to go for insulation in various Altec builds. I thought i had it determined that the Owens Conrning 703 unfaced 1" thick boards would be best, and they may, but I can't get it here. They require huge quantities. it appears to be available on Amazon, but shipping is not Prime and really expensive.

I can get the Roxul Rockwool AFB product 2" thick for $52.91 /bag. About $.55/sf

Rockwool still a viable option?