"I have done a bit of research, I've seen the Tyros 4 on sale on various Italian sites (about 10 of them) and all their prices are the same € 3679 ($5125 £3215) 20% VAT included.
Even the shop where I got mine for €3250 last Friday has the new price of € 3679.

So I was quite lucky to get mine just in time at € 429 less. ($597, £374).
I don't understand why all shops have the same price, is this Yamaha giving order ?

Why this increase ?

The Tyros price is with no options included."

source YPKO T4 forum..: