Dollartree has that for a buck for 5 lbs or so. Pure DE sold as their cat litter.
I used to buy DE for bugs from online (16 years ago or so) and it was pretty expensive to buy and ship.
If you use it around food or pets, make sure it’s food grade. Not all of it is.
I’ll have to investigate the stuff at Dollar Tree now :) Shuckeydarn. I hate dollar tree trips /s