Most Economical 3-6pcf Fiberglass?

I am in need of many many cubic yards of fiberglass. I will be totally filling my wall cavities and also building SuperChunks style bass traps. Anything in the range of 3-6 pcf is fine. Loose, rolls, or blankets of fiberglass are all workable. Rigid is out. What is the best bang for the buck? I used 4" USG Thermafiber blankets for my last studio, but it was costly. I hope I can save hundreds of dollars somehow. Any tips? Thanks!

Black, if you were to read the very first item in the forum and comply, you'd be much more likely to get a response - http://www.johnlsayers.com/phpBB2/viewtopic.php?t=3231 Thanks... Steve

Thanks!

I'm not sure you understand what makes some insulations "rigid" - in the range of 3 to 6 PCF, all boards are so compressed that they are more or less rigid. Few other things - for inner wall insulation, plain ol' unfaced standard house insulation (fiberglass) with moderate compression fill is as good as any, and a LOT cheaper. For acoustic treatments, 3 PCF is kind of the defacto standard; it makes almost zero difference whether you use mineral wool, slag wool, sheep wool, fiberglass wool, as long as it's 3 PCF (up to 5 or 6, but 3 is generally more even absorption especially at NON-incident angles) - generally, mineral wool can be had for quite a bit less than fiberglass of the same thickness and density, and tends to be a bit more defined in shape so frames aren't always necessary (unless you WANT frames for aesthetics) when building free-standing gobo's. These guys http://www.spi-co.com/servicecenterdirectory.mv have locations in Syracuse, Albany, and Rochester but nothing in NYC - they typically handle at least one or two products at any given time that will work for absorbers. As I said, for inside your walls the regular "pink stuff" without facing of any kind is as good as the rigid stuff, and BETTER than anything over 3 PCF when it comes to blocking bass. HTH... Steve