it depends what in the purpose of your company, do you plan to sell online? do you provide services/consulting? do you want to receive and forward funds between companies?
If you sell online and need to be anonymous, you need to buy a company with a nominee director.
Depending on the EU country and the lawyer behind the setup, you can imagine in Eastern European countries:
Min. 2-4k€ for incorporating (one time fee) with the bank account and the nominee
Min. 1k€ per month as a service fee
My advice, if you pay less, watch out.
Remember that, sometimes, you need utility bills of the company, utility bills of the director/shareholder, copy of the ID/passport of the director/shareholder, etc.
You also have lawyers opening companies in Netherlands for 15K fee and 2K per month.
The price will always be related to the quality of the setup, again, it depends on your business/needs.