Z1 has a high markup on any parts they themselves don't manufacture. You can also buy them new for $630-740 shipped:
Blitz - SBC - i-Color - Nengun Performance
or
Blitz 15083 SBC i-Color Spec-R Sequential Boost Controller Black
If your price is fair, I would be interested in buying once you provide pictures of the unit, all of it parts, and proof that it does in fact power up. Thanks.