Why not combine some of the BIS warbond CCU's to get a cheaper BMM
Get a warbond Spartan $65
Upgrade to a Warbond RAFT $30
Upgrade to a Warbond Ares $90
Upgrade to a Warbond Redeemer $25
Upgrade to a Warbond C2 BIS $40
Upgrade to a Warbond 600i BIS $45
Upgrade to a BMM $75
Out the door for $370...