Now days, I get the sense it is more usual than not to use search firms for coaches, just an universities almost always use search firms for executives and administrators (presidents/chancellors, deans, ADs, etc). I don't believe there is any stigma attached to it, and it makes total sense to me in that it makes it easier to identify and contact interested candidates, particularly in today's climate where coaching searches are subject to intense scrutiny from fans. UNC-CH and NCSU have used search firms in recently hiring ADs, football and basketball coaches. Shit, even UNC-Pembroke used a national search firm. They don't come cheap, but it seems like universities have found them to be valuable.