HPI is releasing the Hellfire SS packaged with the standard K4.6 engine at roughly $550.0 , so the price of the full on kit presumably had to come down some. The current price is still extremely low, since a K4.6 doesn't cost $300.00. I would assume this is a tactic to move the product a bit more. A company like HPI can take a small dent in profits for a short time, but I doubt this price will stay around for too long.