beanbag chair filling?

[moukin.livejournal.com]

Does anyone know where to get the sort of styrofoam bead sizes that are good for filling beanbag chairs with? I checked Walmart, Michaels, and Hobby Lobby and couldn't find anything. Hobby Lobby came the closest with microbeads, but those are way too tiny and not cost effective for as much as I would need. I've found some online sources but the sheer size of the bags makes shipping fairly expensive, so I was hoping for stores I might be able to find in my area.

Thanks in advance!