these guys have a weird way of doing buisness...
they drop the price of their product, at the same time they "upgrade" it with a "new" and "improved" valveblock... (not even bothering to mention anything about it in their advertisement) how nice of them.
strange that they still would sell the old valveblock as an upgrade to this new one tho...
anyways.. if they wont give you the 4 valveblock, i recomend you dont buy it. if your block starts leaking then go for another manufacterer, i think premacon has a 3 way block for around 250 eur.
and maybe look into another motor and esc.