I wonder if you're really asking for a remote which can control 3 TVs from one room. That would require a remote capable of sending commands via RF rather the the infrared used by normal remotes. It also requires a RF receiving unit at each TV, or a remote which can send IR to the lounge TV, and RF to the other TVs. 50 Euros isn't going to do it.

But is that what you really read? Why do you need to control 3 TVs at once? What's the point of controlling TVs that you can't see?

If instead you want a remote which you can carry from room to room and have it control the TV for the room that the remote is in, then a number of relatively cheap universal remotes can do that using normal IR.

If each room has a TV plus other equipment that needs control, I would recommend simply getting three identical inexpensive universals.

I'm familiar with OneForAll infrared remotes, and can tell you how to set them up to control 3 different TVs.