I don't buy Chinese or e-bay generally (WS2803 is one exception), except for iteadstudio.
dipmicro.com in Canada/Western NY, taydaelectronics in Thailand
and Digikey, Mouser, Avnet, Pololu.
Sometimes Newark. They have eagle symbols for some parts too.
Phoenixent.com for strip sockets & headers & wirewrap stuff.
I use these sources for their repeatability.
Digikey/Mouser both irritating digging down trying to find things like header strips. I buy that kind of mechanical stuff from pololu and phoenixent instead.
For resistors, caps, transistors, diodes, surface mount, digikey is the best.
Mouser has best prices on Atmel parts.
Avnet for TPIC6x595 shift registers.