I'll circulate unvetted, non-client technical communications opportunities to my 7000+ member LinkedIn network, several other informal networks (by specialty and region), and usually also a few handpicked candidates. You then screen, interview, and hire the right resource on your terms. This isn't recruiting as much as it's a trusted spreading-of-opportunity service, but it routinely gets quick results.

If you need to break through the noise generated by sourcing services who don't understand your needs (or care), you'll get much higher signal ratios this way.