My favorite on-line sources…
WhimBeads
Delicas and other Japanese seed beads in all sizes, fancy shapes
Empyrean Beads
Many antique and vintage seed beads
Kawahara
Seed beads with dichroic coating ~ fantastic!
FusionBeads
Great selection of Japanese seed beads with quantity discounts.
…and my favorite catalogs
Rings and Things
A huge selection of larger seed beads and mixtures
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Comments
Beyond Beadery is another great place. They even let you know which colors are dyed/may not be colorfast.