I don't know if anyone is aware of this, but Aixiz is now selling the glass lens for their standard modules on E-bay.
http://cgi.ebay.com/Glass-lens-for-AixiZ-12X30mm-laser-modules-and-cases_W0QQitemZ120222823875QQihZ002QQcategoryZ53141QQrdZ1QQssPageNameZWD1VQQ_trksidZp1638.m118.l1247QQcmdZViewItem