Glass beads/pellet sourcing?

I want to try my hand at a weighted blanket but read it needs to be 10% of your body weight. I’m a fluffy lass so I’m wondering who the best source would be for the glass pellets or stainless steel shot? According to sites those will be the most cooling and hypoallergenic but can’t find them in bulk

Never tried this place … but this place on Etsy sells packages up to 20 pounds. The larger packages look to be about $1.50/lb.

That would be far cheaper than shot.