Help a newbie out on some questions on my setup

[Egon]

The Jupiter 3 38 is a good upgrade for the Mercury 2. It's a good training rubber with a very grippy topsheet and low speed after the factory booster wears off. The topsheet lasts a long time.

 

[Grumms]

Sriver's under €20 from Japanese sellers online. I think the price goes up in your place because of shipping & seller's profit or maybe your seller scammed you 😂

That's basically the official price from Butterfly eshop : https://be.butterfly.tt/catalogsearch/result/?q=sriver