In France, we are gonna play with P ball at september, so I take a look about prices ... I am very surprised about the price increase
Do you know why ?
Wait until you try to play with the Chinese seamed balls. Then you will feel truly screwed.
The seamless balls and the Nittaku Japan Premium 40+ are ok. But for some reason, and I really don't understand why, European leagues have had a tendency to choose to use European branded balls that are actually plastic seamed balls made in China by either DHS or Double Fish. They are not just expensive, they are horrible in every way.
Maybe your clubs and leagues will avoid them, probably they won't.
By the way, that choice is not the only one they have. Joola for sure markets a seamless ball that is not bad, in addition to the horrible Chinese seamed ones. Not only do the seamless balls play better, they last longer too, and a higher percentage are round, so for a club it is a better economic decision.
I have tried most of the balls on the market and have been playing exclusively with plastic for 2 years now. PM me if you have questions.