For laser products there are only a few brands I'd bet my life or safety on.
Green lasers are more advanced but burn brighter(use power faster) so keep that in mind.
A few good brands, IMO, include; Viridian, Surefire, Insight, Crimson Trace(CT), Lasermax, EO Tech.
Avoid the cheap mall ninja stuff,
Sources for kit include: www.lasermax.com www.crimsontrace.com www.surefire.com www.midwayusa.com www.policehq.com www.galls.com www.uscav.com www.qmuniforms.com