I wouldn't go that high. I would figure...
And think that you are saving them selling online and losing on PayPal fees and shipping each thing. I would offer $400-$425 and give that reason, not a bad offer at all and is great for them as it saves the hassle of pleasing 4 people and gets cash in hand fast.
My thought process though.
CCM 6.5 Storm Trooper
CCM T2 Fireball
Luxe 2.0 Hypnotic Edition