I am trying to find a source to purchase enough of these micro
polystyrene "powder" beads to make and fill bean bag chairs. I have
been unable to find sources and/or prices to determine if the cost of
using this product is feasable. These beads are used in smaller
pillows such as the HugOO Comfort Pillow
(http://www.sharperimage.com/us/en/catalog/productview/sku=SR359BLK/catid=304/pcatid=3),
Moshi pillow (http://www.lnt.com/product/index.jsp?productId=1765077),
etc. and are sometimes called therapeutic micro beads. If I could find
a source and the size of the beads used in these pillows I can procede
with my project. Any help would be greatly appreciated.

As a suggestion, you may also want to cross post this question in the
Science category.

http://www.beanbagbeads.com/Index.shtml.  I ordered a bunch from this
site.  They aren't quite as tiny as the beads in the Mooshi pillows,
but they are perfect for bean bag chairs.

I also am looking for these beads.  Have you found anything out about them yet?

In fact, the site listed above DOES have them, see:
http://www.beanbagbeads.com/micro_polystyrene_powder_beads.shtml