The closest thing I can find is a light bearing Level 3 holster for a Glock 19. And it's over $100. I don't even think that would fit though because the laser you mentioned looks to be quite a bit bigger than the light that blackhawk sells in a package deal with the hoslter.
Blackhawk does offer a L2 light bearing holster, but not for the Glock 19. I know safariland makes a lot of holsters that accomidate rail mounted accessories, and they have a similar autolock system as the serpa, but it has a thumb release I believe.