Due to the nature of these listings they are not eligible for any discounts regardless of if you are a DDC member or not. If purchased on a sale it will not be fullfilled you will recieve a message about the order asking for the difference. 
This unique or charge upgrade is available for any class of Bnv currently released this is one thing you're being bnvs are unable to do so the charge an upgrade allows them to handle Mega Energy from the mech as well as create with energy think of this as more of a training class for BNVs that are already existing this upgrade also allows your BNV to form its own mech armor style suit as well as they can summon a mech steed and use mech swords.