Harbor Freight Tools is another possible source. They offer high speed steel micro bits in metric sizes (see: www.harborfreight.com/high-speed-steel-micro-drill-bit-set-30-pc-61526.html) and carbide micro bits in assorted sizes (see: www.harborfreight.com/high-speed-steel-micro-drill-bit-set-30-pc-61526.html).
The carbide bits are very sharp but very brittle. They break easily! If you use a pin vise and exercise patience, they will drill many holes without breaking. If you often break carbon steel or high speed steel bits, forget the carbide bits.