I have too many indoor plants to be fussing around with going to the hardware store every month for another 8qt bag of perlite. Fortunately, we live in a timeline now where I can buy a hilariously humongous bag of perlite from my couch for dirt cheap. I have a 50 pound bag of perlite in my garage, lol.
The perlite itself seems to be of a larger grade than most perlite you get from the gardening center, but for my purposes (simply adding drainage to my soil for my indoor plants), this works just fine. The quality seems to be pretty good, too; my plants seem quite happy! I don't know if I'll ever run out of perlite for as long as I live now, but if I do, I'd definitely buy this again!