Pricing on the email they sent out today is $6,688 AUD w/GST without ECUTek tuning.
The USD is pretty favorable against AUD right now so that comes out to $4,312 USD. Harrop has US distributors for other products, I'm sure they will pick one up soon for this and the pricing will be less than $5K.
This is the dyno they included as well. Also notice it has the boost on it, .6BAR so a little less than 9PSI, which is nothing on that supercharger.