You can always make your own 'seed-bead' using a French Press nylon ball (1/8") and an eppendorf. Or in the absence of French Press consumables suppliers, just find your local industrial gadget supplier (I found Dejay Distribution Ltd in the UK via google). They quoted me £4.45 for 100 x 1/8" nylon balls. That should keep you going for a while.
Apparently these type of balls are used in valves, bearings, and flowmeters and are resistant to most chemical, oils and greases. They can also supply balls of steel, teflon, polypropylene, glass, ceramic, etc of the same size if you really, really want. Magnus p.s. I'm not a rep for them, just a google-searcher. Honest. The University of Dundee is a registered Scottish charity, No: SC015096
