The chunky perlite from fox farm is the shit, though hard to find sometimes. I was told that perilite is a byproduct of the Sheetrock and gypsum industry, so since recession has hit building and construction industries Sheetrock is in less demand therefor there is less byproduct, perilite to go around. Now I'm not sure if this info is right but it may help you somehow.
Oh the chunkier the perilite the better drainage and aeration the faster roots grow. Hope this helps
thanx for all the responses. I was think about the Home Depot perlite but it did look to small. I asked my local hydro store for FF big n chuncky and they said they couldnt get it.all i found was Sunshine and something called maiden earth#4 . will probaly call around more tomorrow and see if i can find Fox Farm perlite