fiberglass is 2x more expensive than rockwool. the cheapest supplier i found so far is:
philippine insulation
pascor bldg pascor st brgy san antonio
sucat, paranaque near casino filipino
call 8517135
by the way, its cheap for me because i live in the south and if i factor in gas and toll gate fees, i would end up saving more if i buy 270 per panel there than look for the store with 250 per panel
also, please be aware that the 250 per panel price is for "rigid" rockwool. if you are going to use it for walls, you need blankets which is a little more expensive by a hundred plus pesos more.
update na rin sa studio build ko: nag start na ko sa room treatments muna
here are the first 2 of my bass traps. 2" thick rigid rockwool panels i got from imc traders at the alabang home depot for 300+ per panel
i really messed up my initial estimate of 1500 per panel because i thought i was going to use blankets which are 1150 per roll. yun pala dapat rigid type ang gagamitin so nakuha ko yung 2 panels at half the price nung blanket
total cost per bass trap is 845
wood 1x2x12 = 110
katsa = 45 per yard
rockwool = 318 per panel but will use 2 panels per trap
thumbtacks = 8.50 <- its too expensive to buy a staple gun