We can find this rgb led panel connected in 120x30cm up to 450 € on the Internet!
This is to say that even on technology, the internet is not necessarily the best place and the traditional shops can still be competitive and that's good!
Here is the sign in question:
And the corresponding product sheets (free ad):
130 € at Leroy Merlin (store and internet prices are the same):
https://www.leroymerlin.fr/v3/p/produit ... 1500442564
169 € at Amazon (Prime):