I bought a whole bunch of jewelry grade titanium off ebay for about $20, including shipping (which made a couple of z-stands and 12 titanium stakes). If you can't score an ebay deal, there are several distributers who sell titanium rod. As the article indicates, BPL hopes to have some for sell this fall. I would buy 6Al4V, because I am more familiar with this material from cycling. I don't know how different 3Al2.5V is from 6Al4V. Any metallurgists out there?