take-off has some black fasteners, but i don't think they do the screws in black (unless you want the black oxide steel ones - which are really good screws).
otherwise, you'll probably just have to piece together what you're looking for. tamiya has some black stuff, hpi, serpent etc. go to tower and get creative with your searches.
(let me know if you end up finding a place for the 3mm screws in black aluminum).