Must be cheap like $200 is my best guess. Haven't bothered to look at the website. I wouldn't pay more than $200 since the ATP2 pistol with detachable factory carbine stock were on clearance at HatsanUSA for around $260 recently IIRC.
The premise looks interesting, but when I google it, it seems like more store (along with the manufacturer's website) were flogging refurbished one (now sold out).
- If there are so many refurbished to sell, I'd be a little weary