Almost 30 eur. is a lot of money to charge for the standard format. I won’t use PCB Pool because of it since they don’t take the native format of my PCB software.
I use PCBCART instead, very good quality (although I’ve only had 10 boards from them, I’ve never had a dud, they are nicely made, they don’t have lots of niggling requirements, they can do things like slots and gold fingers - and best of all, if they have any doubt at all about your layout they email and ask you, I’ve found their customer service so far very good, and I’ve currently got an order in with them). Others I know have said lots of good things about PCB Train if you need a UK operation that accepts Gerbers.