There are a few top brands(ie NOT mall ninja knock-offs
I'd check www.Lasermax.com
or the highly rated www.Crimsontrace.com
Viridian offers well made robust green lasers. The one green laser has a white light with strobe feature. Very handy for home protection or vehicle use at night but the laser aimers/lights are not cheap.
CT has a free 2013 catalog & DVD guide. They are rolling out a few new green laser models.
Lasermax is popular too. They make guide rod type red dot lasers that blink.
Also see; www.galls.com www.policehq.com www.natchezss.com www.uscav.com www.midwayusa.com
Depending on your budget & selected uses, Im sure you can find a good laser aimer or laser-grip.