John Sayers' Recording Studio Design Forum

J & S Supply Corp in Long Island City (Queens), New York is an excellent place to source your OC703 or OC 705. They also seem to keep a good amount of the 2" stuff in stock -- but I believe you need to order ahead for 4".
(718) 786-3044

Owens-Corning 703 (2") is $1.10/sq ft
Owens-Corning 705 (2") is $1.80/sq ft

J & S Supply Corp
Long Island City, NY
(718) 786-3044