I find digikey, mouser etc. to be much too expensive in shipping for small quantities, but maybe that's where I live. For small quantities, you can go for the likes of DX or banggood, but better quality/binning (colour binning as well as performance bin) seems to come from the likes of Illumination Supply, LED Rise, etc. FastTech can come in somewhere in either of those two groups. Those latter few can sometimes actually come in cheaper than the bulk china sites.