Crimson Trace recently announced their latest laser for the popular Smith & Wesson Shield. The LG-489G is in their Laserguard series which means it attaches to the trigger guard and sits under the dust cover for a low profile. This particular model features a green laser diode which is more visible in day light.
Crimson Trace says that they will have holsters available for purchase at the time of release. Given the popularity of CT products, you can expect that custom holster makers will also support the LG-489G.
Like all CT lasers, the LG-489G features their Instinctive Activation button which activates the laser when the handgun is gripped. This feature, coupled with their quality, is why I use their lasers.
Check out the new LG-489G at Crimson Trace.