Southern Small Arms is having a sale on the Fobus M44 for $100
They also sell the G-2 Nitrolon for $32, the fobus light mount is $22 IIRC, and you can get a tape switch from them for $19.
That is $179 for a complete light mounting setup. You would just need to get the vertical grip, I dunno if they have the grips or not.
Contact them at email@example.com . HTH