Both Brent and Becky's and VanEngelen are sold out of Camassia leichtlinii 'Blue Danube'. I put some in last year and they're great.
Does anyone have more bulb sources that I can try?
Camassia
I can't vouch for any of these, but Google helped locate:
http://www.shepherdseeds.com/100409-product.html
http://www.diggingdog.com/pages2/otherplants.php
http://www.gardenimport.com (click on End of Season Sale, then on Spring Bulbs and you will find it listed.)
Digging Dog is not yet in Gardenwatchdog, but the other two are showing positive feedback.