Please forgive me up front for the long post.
I asked G&G about cost but they didn't know yet. I would guess it is gonna be somewhere in the $130 to $200 range. The VFC EGLM is about $130 but that one is not the best launcher i.e., it does NOT support CO2 grenades.... I had to re engineer the internals of that launcher with real metal rods to support the high pressure CO2 madbulls.
I would hope (if they are smart) that this GL would support all 40mm form factors so madbulls, pro-arms, king-arms, i.e., any 40mm factor.
And if they are really smart, they will build this GL to be a standalone unit meaning, out of the box, it will fit the G&G FN2000/G2010 like a glove with no issues.