No idea on the Lasermax, but the M3 Illuminator seems to be a popular choice for the Glocks (I prefer the Surefire unit).
Ivanhoe's Warehouse (http://www.ivanhoeoutlet.com) and Botach Tactical (http://www.botachtactical.com) are places you can buy the M3.
You can buy the Surefire unit from Lagger Pro (http://www.lagger-pro.com) or Botach.
If you order from Botach, make sure you call first to make sure your item is in stock. Do a search for Botach and you'll see why.
HTH,
Justin
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Justin T. Huang, Esq.
late of Kennett Square, Pennsylvania
[This message has been edited by jthuang (edited June 12, 2000).]